jspENC wrote........"One thing to try is go to your circuit breaker, or fuse box, and try turning off one at a time to see if something plugged in on that circuit is causing the loss of the channel. Turn one off, go to the TV and check, go back to the breaker, turn on again, turn the next off, go check... etc... Just be aware of what circuit your TV and amplifier is on. In this case, unplug all other components and check that way. I found a touch lamp was causing me problems at one time."
Problem solved............The hard way.
I set up a 12VDC TV off my car battery.....Turned off the main breaker and guess what?
Then it was only a matter of shutting off individual circuit breakers. The problem was the power supply on my wife's laptop. The 13 element beam delivers a strong signal on 15 now. Hard to believe something like that could give off that much interference. Replace it with another P/S
and no more interference.
Now for the rest of the story...........
When I was putting up the 40 element beam, I fell through the attic access opening, crashing a ladder, breaking glass and ending up in a crumpled mess on the floor. I was extremely lucky to get by with a sore ankle and elbow plus a few nicks.
Now I have this long 40 element beam filling up a good part of my attice storage space! (g)
Thanks a lot for the responses, appreciate it.