At its height, the company consisted of KRMG and KWEN in Tulsa, KKNG in OKC, a station in Wichita, one in New Orleans, one in San Antonio, another in Albuquerque, and the Texas News Network.
From my recollection of reading Broadcasting and Cable Yearbooks, I believe Swanson also owned 99.5, possibly KZZX, along with KQEO. He expanded in San Antonio by adding an AM to his portfolio, and I believe he also had KFJZ 1270 and KWXI 97.1 in Ft. Worth/Dallas along with the Texas News Network.
He sold much of his portfolio to New City Communications in the 80's. After selling his empire, he bought a Tulsa move-in and ran AC on it. I was just starting as an intern at, ironically, KRMG and KWEN when he blew out all the live staff except the morning guy and ran SMN's StarStation on it. He dumped that station a few years later. Gerry was probably about ready to retire as he passed not too long after that.