(I live in Riverside California, about 60 east of Los Angeles).

Most of the channels come in OK (from good to great) but some channels
are lousy (very snowy). Almost all of the signals come from broadcast
towers on Mt. Wilson (about 45 away).

I've installed a new antenna (the "old"-style) but not a dish antenna.
The antenna is rated for the distance.

I've run a new coax-cable from the antenna through a signal-amplifier
to the TV, which is about 30' from the antenna. The antenna is
horizontal and is pointed toward Mt. Wilson. (I first used a compass
then the old "turn it until the picture is OK" trick but neither
improved the reception.

I don't think there are any sources of interference between Mt. Wilson
and the antenna.

Does anyone have any suggestions? (I don't want to get cable-TV).