Washington's "Jam'n Oldies" radio station made a big splash during its first full Arbitron ratings period, just as that format has in every other market where it has debuted.

WJMO (99.5)--the former WGAY, which switched its format in April from easy listening to oldies--appeared near the top of several categories in the spring ratings reports, which were delivered to stations yesterday.

"When we first put Jam'n on the air, we knew it was the perfect format for D.C. because it mirrors the market," says Bennett Zier, general manager of WJMO. The station targets ages 35-49 and aims for an audience that is about 60 percent white.

The format--a playlist composed mainly of Motown and '70s dance hits--was devised by Chancellor Media Corp., which owns WJMO, and has been rolled out in large cities such as Los Angeles, Chicago and New York over the past few years.

WJMO's success seemed to come largely at the expense of black oldies WMMJ (102.3), which took a ratings dive in the period from April 1 to June 23.

Occupying their customary top spots for all listeners 12 and older were black adult contemporary WHUR (96.3), black hits WPGC (95.5) and hip-hop WKYS (93.9), which finished first, second and third.

Elsewhere, WJFK's "Don and Mike Show"--which routinely dominates the afternoon-drive slot among men--captured that time segment's No. 1 spot among all listeners for the first time. WJFK (106.7) management tastefully rewarded Don Geronimo and Mike O'Meara by sending two strippers to the studio yesterday for an on-air celebration during the talk show. The grunts and moans emanating from the radio were reminiscent of a porno movie soundtrack.

During the high-revenue morning-drive time, Howard Stern--carried on WJFK--retained his customary top position among men 25-54, the most coveted demographic group for advertisers. The syndicated shock jock was followed by all-news WTOP (1500 AM) and syndicated host Tom Joyner, carried on WHUR. Dropping in the ratings were the morning shows at DC-101 (WWDC)--where a new host, New York's Elliot Segal, will debut on Aug. 16--and Classic Rock 94.7 (WARW), which completed its first ratings period after firing Doug "Greaseman" Tracht for telling a racist joke on-air. During morning drive, women 25-54 preferred Joyner, followed by the Jack Diamond and Bert Weiss show on Mix 107.3 (WRQX) and Dave Adler on Oldies 100 (WBIG).

On the news side, WMAL (630 AM) enjoyed its best spring ratings period in four years, reports John Butler, the station's operations director. WTOP's ratings stayed relatively stable after a significant rise during the last ratings period, which included the impeachment of President Clinton and the NATO campaign against Serbia.

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THE NUMBERS GAME

The spring Arbitron ratings for total audience, compared with the previous quarter. A share is the percentage of the radio audience that is tuned to a particular station over the course of a week. Previous rankings are in parentheses;

T denotes a tie.

1. WHUR (96.3), black adult

2 WPGC (95.5), black hits

3. WKYS (93.9), hip-hop

4. WBIG (100.3), oldies

5. WMZQ (98.7), country

6. WJMO* (99.5), oldies

7. WJFK (106.7), talk

WRQX (107.3), adult hits

9. WMAL-AM (630), news/talk

10. WWDC (101.1), rock

11. WGMS (103.5), classical

12. WASH (97.1), soft rock

13. WMMJ (102.3), black oldies

WTOP (1500 AM, 107.7 FM), all news

15. WWVZ (103.9/104.1), Top 40

16. WJZW (105.9), smooth jazz

17. WHFS (99.1), rock

18. WARW (94.7), classic rock

19. WTEM-AM (980), sports talk

20. WFRE (99.9), country

WPGC-AM (1580), gospel

WAVA (105.1), Christian

Spring

5.9 (1T)

5.5 (1T)

5.0 (3)

4.7 (6)

4.6 (4)

4.5 (7)

4.4 (8T)

4.4 (5)

4.3 (8T)

3.8 (11T)

3.7 (13T)

3.6 (13T)

3.5 (4)

3.5 (11)

3.3 (15/16)

3.2 (17)

2.3 (19)

2.1 (18)

1.2 (20)

1.0 (23)

1.0 (21)

1.0 (22)

Winter

6.2

6.2

5.8

4.2

3.9

4.1

4.0

4.3

4.0

3.7

3.6

3.6

4.4

3.7

3.4

3.0

1.9

2.3

1.7

0.9

1.4

1.3

*WAS WGAY UNTIL APRIL 13, 1999