Reviewed by Peter Berk, President and Chief Media Strategist, Berk Marketing · Last updated 16 September 2026
Los Angeles · KOST 103.5
One of the largest adult contemporary audiences in Southern California, and the station that becomes the market’s holiday station every November. Berk Marketing buys KOST for advertisers and represents no station in this market.
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Short answer. KOST 103.5 is an adult contemporary station in Los Angeles owned by iHeartMedia, and it is one of the most listened to signals in the market. Because it is a music station rather than a talk station, it takes more commercials a week to land a message, not fewer, and the budget belongs in weight on one station rather than spread across several. The practical entry point for a Los Angeles schedule is around five thousand dollars a week, and most advertisers should be buying it on remnant, which is typically 40 to 60% off the published rate card. The one thing every advertiser should know about this station before planning a year: from early November it switches to all holiday music, and that is a different station commercially from the one it is in June.
The argument, made literally
Most people who tell you music radio works differently are repeating something they read. This is the version where the person saying it sold classical at KFAC, hip hop at Power 106 and country at KZLA, all in Los Angeles, on air and in sales, before ever representing an advertiser.
That matters on a station like KOST because the advice an advertiser usually gets about music radio is either dismissive or oversold. Neither is much use. What actually decides whether the buy works is how the audience uses the station, and that is something you learn by selling it, not by reading about it.
The full career, nine formats and a dozen stations, on air and in sales, before ever representing an advertiser.
The idea that changes a schedule
Adult contemporary is a workplace and commute format. It plays quietly in offices, waiting rooms and cars for hours at a time, and the listener is not sitting down to concentrate on it. That is the format doing its job. It also means a single spot in a week is close to invisible, and a schedule built the way you would build one for a talk station will disappear.
A music listener is tuned in but only half attending, and there is nothing wrong with that, it is how music radio is used. It does mean a message has to arrive several times before it registers. So a music station is a frequency buy, not a reach buy, and the budget belongs in weight on one station rather than spread thinly across four.
This is where most Los Angeles music buys go wrong. An advertiser is sold a light schedule across several stations because it looks like broader coverage. It is not. It is the same money divided until none of it is heard on any of them.
The part nobody explains
Half attention sounds like a weakness until you look at the other side of it. Music radio audiences are the most habitual in the medium. The same listener puts on the same station at the same time on the way to the same job, and does it for years. That is why the frequency a music station needs is achievable in the first place: you are not chasing new people every week, you are reaching the same people again.
A news or talk station gets you attention and needs fewer spots. A station like KOST gets you repetition against a large and predictable audience. Both work. They are bought differently, and a plan that treats them the same will overspend on one and underspend on the other.
The Los Angeles fact worth planning a year around
Every year since 2001 KOST has switched to all holiday music in early November and stayed there until a few days after Christmas. It is not a stunt and it is not a few songs an hour. The station changes what it is for roughly seven weeks.
Holiday music pulls in listeners who do not otherwise use the station, and it pulls them in for long stretches at home and at work. For those weeks KOST reaches a considerably wider and different audience than its normal adult contemporary listening delivers.
Advertisers who know this book it early, so the good positions go first and the season is the tightest inventory of the year on the station. If you want to be in it, the conversation happens in summer, not in November.
Retail, gifting, travel, restaurants, jewelry, anything with a fourth quarter. If your business does a meaningful share of its year between Thanksgiving and Christmas, this is the single most useful piece of Los Angeles radio scheduling information there is.
If your offer has nothing to do with the season, those seven weeks are the most expensive and most crowded time to be on the station, and your message competes against every retailer in the market. Buying KOST in January is a completely different proposition from buying it in December.
Before you sign anything
The rate card is an opening position, not a price. What actually decides what you pay:
The holiday season is the most contested inventory KOST has. The same schedule quoted in February and in November is not the same negotiation, and the gap is wider here than it is on a station with a stable year.
Morning drive and the workday carry this format. Adult contemporary is used differently from a music station aimed at a younger audience, and the middle of the day is worth more here than the assumption usually allows.
Demand on a station this size moves week to week. A rate that was unavailable in one month can be available in another, which is most of what remnant buying takes advantage of.
This one is not about price at all, and it is the one advertisers do not see coming. See below.
The rule that costs advertisers the most
If you contact KOST directly and a seller quotes you a rate, that quote follows you. Once a station has your name against a number, an agency coming in behind you has very little room to negotiate on your behalf, and in many cases we will not be able to represent you on that station at all.
There is nothing improper about it, it is simply how station credit and account assignment work. It is also completely avoidable, and it costs nothing to avoid. One call before you make any other call is the whole of it.
Berk Marketing represents advertisers. It owns no stations, sells no inventory and is paid by the advertiser, not by iHeartMedia. The station list on any plan starts from who reaches your customer, not from who is paying us.
We will run a competitive monitoring report at no charge and with no obligation. It shows which stations your competitors are on, at what times of day, how many spots, and it includes the actual audio of their commercials.
In many cases nothing shows up at all, and that is worth knowing too. You have to start by knowing what others are doing.
Get the ReportThe way most advertisers should buy this station
A commercial break with an unsold unit in it earns the station nothing. Stations would far rather sell that unit quietly and cheaply than let it run empty, and that unsold inventory is what remnant buying is. It is not a lesser class of airtime. It is the same station and the same dayparts that full-rate advertisers buy, priced differently because you are flexible about exactly when your spot lands. In practice that is typically 40 to 60% off the published rate card.
The budget is placed before anything airs. That is what buys the access to the discounted inventory in the first place.
We aim at Monday to Friday, 6am to 7pm, which is the part of the day worth having on a station like this. Weekends and evenings are available too. Then we track what actually clears.
The station reports back. If a spot was preempted, you do not pay for it. It is refunded or carried into the next flight, your choice.
That last point is the part advertisers usually miss. The exposure on remnant is uncertain, the money is not. You are never billed for a spot that did not run.
Music radio needs weight to work, and weight is exactly what remnant buys you. The same budget that funds a schedule too thin to register at rate can fund one heavy enough to be heard. You give up certainty about exact airtimes, and on a station people listen to habitually all day that matters less than it would on a program-driven talk signal.
You need fixed dates and times, your offer expires on a specific day, or you are tied to an event. Anything genuinely time-dependent should be bought at rate rather than on remnant, and we will tell you that rather than sell you a schedule that cannot deliver what you need.
Fit
You sell something a household decides on rather than an individual, and you can serve the whole Los Angeles area. Home services, healthcare, financial services, retail, travel, restaurants and automotive all tend to work on this format. It also suits an advertiser who can commit to a real schedule for several weeks rather than testing with a handful of spots.
Your budget only supports a light schedule, your offer needs a long explanation to make sense, or your product is aimed at a young audience. A message that needs sixty seconds of reasoning belongs on a talk station where the listener is actually listening. And if the budget will not carry frequency, a smaller station bought heavily will do more for you than this one bought lightly.
Questions
There is no single answer and anyone who gives you one without asking questions is guessing. The rate depends on daypart, length, how many weeks you run, what time of year it is and what inventory is unsold when you buy. The practical entry point for a Los Angeles schedule is around five thousand dollars a week. On a music station, below that the frequency is usually too thin to be heard at all.
More than you would need on a talk station, and that is the honest answer even though it sounds like we are talking you into a bigger buy. A talk audience is concentrating, so a message lands in fewer exposures. A music audience is half attending, so the same message needs repeating before it registers. The practical consequence is that the money is better spent going deep on one station than spread across three.
If your business has a fourth quarter, yes, and you should be asking about it in summer rather than in October. Holiday inventory on this station is the tightest of the year because advertisers who know about the format flip book it early. If your offer has nothing to do with the season, those same weeks are the most expensive and most crowded time to be on the air, and your money will go further in another month.
It depends far more on your message than your budget. If your offer is simple and the job is to make a large number of people familiar with your name, a music station with a heavy schedule is the right tool. If your offer needs explaining, a talk station gives you a listener who will actually hear the explanation, and it takes fewer spots to do it. The mistake is buying both with the same weight.
No. Berk Marketing represents advertisers only and holds no station or network representation anywhere. That is the reason a plan can recommend against KOST when another station suits you better, and the reason it is worth calling before a station quotes you.
Tell us before anything else. Depending on how far it went we may still be able to work with you, but a direct quote already on record narrows what any agency can negotiate. It is the single most expensive thing an advertiser does without realizing it.
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Berk Marketing represents advertisers, not radio stations or media companies.
