Just saw this in the news. FYI
PHOENIX (3TV/CBS 5) -
A construction project in the area of the television broadcast transmission towers on South Mountain in Phoenix will cause intermittent signal issues for some CBS 5 (KPHO) viewers this summer.
The CBS 5 (KPHO) signal power will be periodically lowered substantially for the safety of the construction workers. This is mandated by law.
The signal power will be lowered from 9 a.m. to 5 p.m. for the next few months and will affect some viewers who receive CBS 5 with an antenna.
This does not affect anyone receiving CBS 5 via satellite or cable. Primetime television hours will be broadcast at full power.