I have a Pancet 2500a connected thru my 4DTV with a 10 ft ant. I get beautiful reception on everything except at times on AMC 4 KU on New Abilities TV(Peoples network). AT times the quality goes from 80 to 0 and then back to 80. I was told to add a in line amp. and that seemed to help.I have a gain of 90 on my 4dtv and 80 or so on the level and 80 to a 100 on quality. When the quality goes from high to low,the level on the panset does not change nor does the 4dtv strenght. Most of the time the lows only last a second and then back to normal. Then at times the quality is so bad that I have to move the skew a bit.(the ant has not been moved) Now all the other channels on Horz, work ok all the time. The other channels must be stronger. I called the peoples network and talked to a teck, and he said that cell phone towers can interfear with their stations.(I have one down the road from me) He said since the other channels are a different freq they arent bothered. Have you ever heard of this? At times it will work 2 days perfect and then I might have to adjust it.(no wind) Does any one have this problem?