Rumor has it, that there is no more room on the Master FM combiner at Empire. Maybe when a new combiner is built in several years, there may be, but for now there's no vacancy. The only way there would be, is if WPAT-FM moves back to 1WTC, as it sucked up one of the last ports on the combiner. The focus right now at Empire is on building a full power backup FM antenna, to replace the Alford, in the old CBS TV aperture on the broadcast tower. The odds of WFME moving there, in the near future, are slim to none.
When the combiner was designed, built and installed years ago, there were provisions for expansion to, theoretically, accommodate all 25 NYC stations, which would assume 94.7, of course. These would all feed Alford - 2-bay antenna, which resemble rings on the outside perimeter of the mooring mast, above and below the 102 floor Observation deck windows.
A lot of work has been done since and Scott Fybush does an excellent job in detailing the changes with visits from time to time, and I don't think he gets enough credit for those trips.
Personally, I think some of the most under recognized workers following 9/11/01 were the ones who built, accommodated, and then rebuilt signals from Empire, and the work still continues.
P.s. None of us has really touched on 4TS or 1WTC, since I think there is renewed interest in making that a real location, now that it is topped out.
Jeff in Sa-ra-so-ta!