The peak is in Toiyabe National Forest and is open to the public. The U.S. government's "No Trespassing" sign refers to the inside of the locked building. The orange string is tensioning one end of my wire antenna and is tied off to a grounding cable for the FAA's antenna system.
As we were setting up our equipment, two FAA Radio Technicians emerged from the nearby building where their radios are located and asked us what we were up to. We told them about SOTA, explained that we would only be running low power way down on 14 and 18 MHz (their radios operate up around 120 MHz), and we all agreed that it would be very-very unlikely that our transmissions would interfere with their system. Thinking that they were leaving, I offered to give them my cell phone number so that they could call if there was any problem and we'd shut down immediately. Their response was 'that's OK, we'll be right here and we WILL let you know if there's a problem!'