WNNX (100.5 FM) is a commercial radio station licensed to College Park, Georgia, featuring a classic alternative format as "99X".

WNNX's studios are located in Sandy Springs, while the transmitter resides atop the Westin Peachtree Plaza Hotel in Downtown Atlanta.

Interested in moving the station to the more lucrative Atlanta radio market, owner Robert Gammon proposed that WHMA-FM be re-licensed to Sandy Springs.

An agreement had already been made with the nearest co-channel station, WSSL-FM in upstate South Carolina for it to move its transmitter a bit further from Atlanta.

Susquehanna was also forced to slightly null the station's signal away from the direction of WSSL-FM, to stay in compliance with spacing rules.

When it went on the air in Atlanta, the station had an effective radiated power of 3,000 watts, using the Turner Broadcasting tower, which gave it a height above average terrain (HAAT) of less than 1,000 feet.

It was the first mainstream Top 40 outlet in Atlanta since WAPW flipped to alternative as WNNX in October 1992, as well as a brief stint on WBTS when it debuted in 1999.

[4][5] Despite its 3,000 watt signal, Q100 often received higher Arbitron listenership ratings than several of its 100,000-watt competitors, including sister station 99X.

The upgrade occurred on October 24, 2005 at 5:00 PM, when the station moved from the Turner Broadcasting tower to the Westin Peachtree Plaza Hotel.

[7][8] On the same day, at 6 a.m., 100.5 began stunting, first with Beyoncé Knowles singing "To the Left" (from her song "Irreplaceable") and morning show host Bert Weiss redirecting listeners to the new frequency.

At 10 a.m., the stunting then switched to a loop where eight different formats were presented, with listeners having the option to call the station and vote on which was their favorite.

In 2010, WNNX became the FM flagship radio station of the Atlanta Braves for that season through 2013, along with WCNN, which continues carrying the team's games to this day.

[16] The next day, at 5 p.m., after playing "Enter Sandman" by Metallica, WNNX dropped the rock format and began stunting with a loop of "Bitter Sweet Symphony" by The Verve, with sweepers stating "It's coming, same as it ever was.