Our location is Brooksville, Maine--rural, coastal, hilly topography.
We have a Winegard 7084 (?) directional antenna for 4 DTV stations ~25-30 miles away, all within 40 degrees azimuth. The rooftop antenna is ~ 30' high with a 10 year old coax (to be replaced when the GD rain stops here). The caox is ~ 40' total from the antenna to the TV with a FM splitter disconnected.
Only 2 of the 4 stations come in with consistant signal strength; one, ABC 7, rarely operates.
Softwood trees have been cleared that are in the path.
I've oriented the antenna to face between the transmitters and often move it to try our various orientations as well as re-scanning both single and double scan methods.
Could part of the problem be the transmitters varying the signal ? They say no.
1. Pre-amp such a Winegard 8700 ?
2. New RG6 shilede coax ?
3. Raise the antenna ~ 5-8 feet ?