Summer traditionally brings more listeners to stations spinning contemporary hits and oldies, and this year was no exception. Easy-listening WGAY-FM (99.5) returned to the top of the ratings heap, scoring a 6.7 percent share of the audience 12 years and older (down slightly from its 6.8 share last spring), but two other stations playing uptempo dance music, WDJY-FM (100.3) and WPGC-AM/FM (1580/95.5), made the most impressive gains, according to the Arbitron survey released last week.

WDJY shot up to a 5.7 share from spring's 5.1, continuing an aggressive ratings campaign started two years ago by program director Cornelius (Brute) Bailey. WPGC, which switched to a contemporary crossover format in May after more than a year of floundering with a weakly presented adult contemporary formula, soared to a 4.5 share from 2.1. The station, though in the process of being sold by the Marriott family to Alaska's Cook River Inlet Co., continues to shore up its weak spots.

NBC's WKYS-FM (93.9), for years the market leader in urban programming here, appears to have been hurt most by the uptempo competition as it dropped from a 7.2 share to 5.1 and from No. 1 to No. 7 in rankings among local stations.

WMAL-AM's (630) program director Eileen Griffin credits the Iran-contra hearings and five Redskins games (four preseason and the season opener) with boosting the station six-tenths of a point to 6.6 and the No. 2 spot overall. In third place was Top-40 WAVA-FM (105.1) at 6.1, up from 5.5.

Other big gainers were oldies-oriented WXTR-FM (104.1), which showed its biggest single rise in several years, jumping to 3.0 from 2.3. The LaPlata-Waldorf station has nearly doubled its audience since last winter's 1.8 rating. It made even stronger gains in the survey of adults 25 to 54 years old, jumping to 4.6 from spring's 3.2. Country format WMZQ-FM (98.7), which in August began a total simulcast on AM-1340, held on to its springtime 7.0 adult share, which was good enough to capture the top spot as WKYS tumbled from 7.9 to 6.4 and third place.

WMAL's Frank Harden and Jackson Weaver, who after nearly 28 years of doing the morning show compare themselves with a public utility, continued to dominate the breakfast crowd with a 10.1 rating. They were trailed by WAVA's gabby "Morning Zoo" and WWDC-FM's (101.1) rock 'n' roll storyteller, the Greaseman, both at 6.5.

Here's a look at the summer Arbitron ratings for commercial stations of listeners 12 years and older: Summer Spring 1. WGAY-FM (99.5) 6.7 6.8 2. WMAL-AM (630) 6.6 6.0 3. WAVA-FM (105.1) 6.1 5.5 4. WDJY-FM (100.3) 5.7 5.1 5. WMZQ-AM/FM (1390/98.7) 5.4 5.6 6. WHUR-FM (96.3) 5.3 5.3 7. WKYS-FM (93.9) 5.1 7.2 8. WRQX-FM (107.3) 4.8 4.6 9. WWDC-FM (101.1) 4.7 5.9 10. WPGC-AM/FM (1580/95.5) 4.5 2.1 11. WTOP-AM (1500) 4.3 4.1 12. WCXR-FM 105.9) 3.8 3.7 13. WLTT-FM (94.7) (tie) 3.0 3.2 13. WXTR-FM (104.1) (tie) 3.0 2.3 15. WASH-FM (97.1) 2.6 3.1 16. WGMS-AM/FM (570/103.5) 2.3 2.5 17. WWRC-AM (980) 2.1 2.3 18. WYCB-AM (1340) 1.6 1.7 19. WHFS-FM (99.1) (tie) 1.5 1.8 19. WOL-AM (1450) (tie) 1.5 1.0 Reznick Retires After more than four decades on Washington radio, Max Reznick has retired from his two-hour Sunday morning show, citing health reasons. Reznick, whose ethnic Jewish programming attracted one of the most loyal followings in memory, was off the air at WNTR-AM (1050) for nearly five weeks last summer while undergoing treatment for a brain tumor. Moves in News WMAL's Mark Campbell says "Ooops!" and that talkin' Tom Snyder actually comes from L.A., not the Big Apple ... Mike Anders has called it quits after five years at WMAL to become a computer analyst at BDM Corp., a Defense Department contractor in McLean ... Peter Laufer, one of a handful of reporters who lost their jobs when NBC Radio News closed its Washington bureau, has returned to San Francisco in a general assignment spot with KQED, a public broadcasting radio and TV combo ... Former Nixon aide Charles Colson joins WWRC-AM's (980) talking TV wonder, Joel A. Spivak, this morning between 9 and noon. On Monday, Bev Smith joins WWRC for the noon to 3 show, leaving Pittsburgh's WTAE-AM. Look for WWRC afternoon news anchor Camille Bohannon to quit the Silver Spring talk station soon for the Mutual Broadcasting System in Arlington, where her ex-husband, Jim Bohannon, hosts Mutual's nationally syndicated "America in the Morning" on WWRC and the Saturday night "Jim Bohannon Show" heard locally on WTOP-AM (1500) ... Former WWRCer Bill Hickok has joined WMET-AM (1150) as a sales executive and is hosting a weekday show from 10 to 11 a.m.