Various channels are dropping signal at various times

[JOAT]

Until I get this figured out, this is my simple setup:
2 home made 8 bow tie UHF/VHF HD antennas
1 signal combiner
100 ft drop to splitter (Temporary length, will be 50-60 ft)
4 runs from splitter to TVs, 10-50 ft lengths
Majority of stations are 20-25 mi. away
Right now, 80% of stations are at 6-10 out of 10 bars which seems very good.

Now here is the problem, every so often a couple of the stations loss all signal for days up to a couple of weeks but that "couple of stations" will alternate between various stations. The BIG problem is these stations are ones that my wife watches so, yes I am def in both ears!
I can't see this problem being related to either of the antennas due to the 80% with good/excellent signal strength. I know I may be able to fine tune the direction of the antennas a bit but not much. I don't know if it could be an issue with atmospheric conditions (can't see that, no wind/rain/nothing for two weeks now).
I was wondering if the Winegard AP-8700 Preamplifier would help or hinder based on the good incoming channels.

Any help/thoughts or comments on this will be greatly appreciated!

[winegard]

Good morning Joat,

This is a hard one to answer without knowing some more information, since a preamplifier such as the AP-8700 can only amplify the signal the antenna receives and build it up to overcome the cable loss and splitter loss between the antenna and the TV sets it may or may not help.

First try going directly to one TV set and eliminate the 4 way splitter to see if that helps. You loose 60% of your signal strength going through 4 way splitter so hopefully the extra signal going to a single TV set will tell you if the issue is in equipment loss or the signal is fading at the antennas.

Can you send some pictures of your antenna and antenna array? What is the model number of your coupler? Are the antennas pointed in the same direction or different directions? Where are you trying to receive your TV stations from?

I would suggest calling into technical services at 800-788-4417 and asking for Hans for more information.

[breakthenorm]

to me happens the same with an channel the transmitter is located at 6 miles but this channel is broadcasting with a lower power so not clue how keep the channel without break downs or dropping signal always