[Al Skierkiewicz]

Yes, others will call it the Willis Tower, however, old habits die hard. I have been working in the Sear's Tower since 1975.
Everyone had to shutdown, radio stations included. ERP for single UHF digital stations is pretty high. We make about 15 kW to a 15dB gain antenna, so with losses in the feed line we are making nearly 150kW ERP. Most of the TV stations and FM stations are now on the Tower as the Hancock Center jacked rent a few years ago which got everyone to move. WLS as well as WBBM, maintain backup transmitters at Hancock so WLS broadcast the removal live. We had to shut down WFMT as well for the work. Leading up to the removal, many broadcasters also had to switch to standby antennas for several nights while other work was performed. The 4 MW ERP total number seems about right. In the analog world, UHF stations having ERP of a couple of MW was not unheard of. Of course, altitude of the antenna figures into the calculations.