In any given week, a million or more WTOP radio listeners might hear a rich baritone voice advertise Lockheed Martin Corp. as the "right choice" to build a $10 billion federal law enforcement communications system because "the bad guys aren't going to take a break while we fix it."

But Lockheed Martin's marketing advisers don't care about the vast majority of that audience. They aren't selling beer or soda pop. Rather, in a peculiarly Washington form of advertising, their hope is that the radio spot might reach the ears of the 50 or so employees at the Treasury, Justice and Homeland Security departments who are going to decide which company should get the communications contract.

If it reaches those people -- or their bosses -- the ad is a success, Lockheed spokesman Scott Lusk said. Limited by federal law in how the company can interact with procurement officials, blanketing the entire region with sometimes jargon-filled ads is one of the ways contractors such as Lockheed try to build momentum for their latest contract proposal among the few federal officials who have authority over it.

Lockheed's ad might be followed on the same station by a pitch from General Dynamics Corp. for its competing proposal, arguing that what the country really needs is a "land mobile radio system that provides nationwide interoperability." Football fans at FedEx Field get to hear L3 Communications pitch its contribution to national defense, while those catching the game on radio might hear former Redskins quarterback Sonny Jurgensen offer advice in his distinctive drawl for the best way to handle top-secret information.

"It's very important to get information out to the acquisition board and to the people who will be using this," Lusk said of the ads promoting the company's bid to build a wireless communications network linking federal and local law enforcement officials. "The goal is obviously to win business. Just like Coke or Pepsi does marketing, it's important for us to create awareness about our business."

Advertisements from government contractors have supplanted auto industry ads as the top revenue category for WTOP, the popular news radio outlet, and they have become a staple at its affiliated station, Federal News Radio. They have spread throughout the area's Metro system and are filling air time during local sports broadcasts. Several local trade magazines targeting the industry have seen ad revenue grow by more than 50 percent in just a few years.

Irrelevant and perhaps even indecipherable to many who see or hear them, both marketing and company executives say, the ads make sense in a Washington marketplace where sales strategies are governed by strict federal rules and companies may invest years of work and millions of dollars just preparing a proposal for the most complicated contracts.

A technology company trying to sell a big computer system to an airline, for example, might take the airline's chief information officer out to a fancy dinner or a round of golf to get to know the executive and make a case for the product. Federal contractors are prohibited from that kind of wining and dining -- they can spend up to only $50 per person per year reaching out to government employees. And while contractors spend plenty of time cozying up to federal buyers at industry networking events, government ethics officials are always on the lookout for violations.

Federal sales are also complicated because companies don't always know who is on the decision committee for a given contract. Marketing executives reason that by blanketing the region with an ad, there is a pretty good chance their message will reach some of the officials who have a say in the matter.

"People who buy off these contracts are all over the government, and obviously there's a high population of them in the D.C. area," said Kevin M. Plexico, executive vice president of Input Inc., a Reston market research firm.

The economics of mass advertising for a minuscule target audience might seem out of whack, but Timothy Calkins, an associate professor of marketing at the Kellogg School of Management at Northwestern University, said it is probably a good business decision.

"If you have a customer who is going to make a decision on a billion-dollar contract, is it worth it to spend $10,000 on an ad to reach that one person? Perhaps, even if you're going to catch a lot of other people in the spray," Calkins said. "It's because that person is so valuable."

And while there may be only a few dozen officials involved in the final decision on a contract, Calkins added, those people can be influenced by others -- like co-workers and bosses -- who might encounter an ad.

That's the idea behind Lockheed's campaign for the IWN communications network, Lusk said. Along with those who will decide the contract, Lusk said, the company also hopes to spread the word among those who might use the new communications system -- and who might make their opinions known to acquisition officials.

In a similar vein, Chantilly-based GTSI Inc., which sells technology products and services to the federal government, has enlisted Jurgensen to make its pitch through sports analogies. For example, in one ad Jurgensen says, "Every passer needs receivers that can play the whole field for a solid 60 minutes. The same is true in federal IT."

The theory: While a small portion of Redskins fans are government buyers, a big portion of government buyers root for the home team.

"Sonny has great personal brand equity -- he's legendary in our marketplace," said Scot Edwards, chief marketing officer for GTSI. An ad during halftime of a Redskins game might reach fans who will never work for the government or buy a big-ticket technology system, but the company is betting it will also reach a few fans who do both. So too are L-3 Communications, which promotes some of its military offerings on the giant video screen at Redskins games, and office supply company Canon USA Inc., which trumpets its government division during the Redskins wrap-up radio show on WJFK.

Neither WTOP nor individual companies would discuss the amount of money involved in contractor advertising. Larry Allen, executive vice president of the Coalition for Government Procurement, said one reason mass market ads are popular among defense contractors is that the cost is low in comparison with the stakes involved and the amount being invested in developing bids.

"They spend so much money putting together their proposals that the relatively small amount of money they spend on advertising is a way to try to protect their investment in the proposal," Allen said. "They might do a $20,000 ad campaign on WTOP, which gets you some nice air time, but that is a fraction of a cost of putting together their proposal, which can easily cost more than a $1 million."

Contractor advertising in Washington's public transportation system is only slightly more targeted than on the radio.

"We buy the lines we know we want to hit," said Eva Neumann, president of ENC Marketing Inc., a McLean firm that specializes in government contractor marketing. For companies trying to reach officials from the Defense Department, ENC buys ad space along Metro's Blue Line, which carries thousands of people to the Pentagon and Crystal City office buildings each day. Companies trying to get subcontracting work with big systems integrators in Ballston or Tysons Corner, however, should advertise on the Orange Line, Neumann says.

Not surprisingly, almost all of the 30 display cases at the Pentagon Metro station are filled with contractor ads -- Northrop Grumman Corp. says it is "shaping the future of defense on land, under sea, in the air, space and cyberspace," while down the corridor another group of companies declares: "It's a new era in maritime patrol."

Even at the nearby Pentagon City stop, where thousands of teens pile out of subway cars en route to a mall, an illuminated ad from Sikorsky Aircraft Corp. says its helicopters, shown gliding among mountain peaks, are "the rescue system that will bring them home."

Ads from General Dynamics, top, and Lockheed Martin vie for the Integrated Wireless Network federal law enforcement communications contract.

Former Washington Redskins quarterback Sonny Jurgensen uses sports analogies in ads for Chantilly-based GTSI Inc., a company that sells technology products and services to the federal government.