jeff:

Antenna is pretty big, A Winegard HD-8200U and the CM-7777 antenna mounted amp.

The reason why I don;t TRUST is I did gain measurements using a Sencore 8VSB tester. My gain measurements were not consistant, but they were not done at the same time. I measures the signal at the antenna and the NEXT day the signal after the power injector (about 30')

Gain varied from 15.6 (physical channel 3) and 27.1 for channel 21. I'm at least 30 miles outside of Philly and aimed toward Philly stations.

The rotor also has a bypass braid around it which many people forget. A large tree is going to hit by lightning first.