I recently put up a new antenna and am experiencing a strange problem. In San Diego there are 2 stations on VHF, channels 8 and 10 (plus at least one from Mexico on Channel 9). I have a Winegard 8200 pointed at 105 degrees to pick up UHF stations and the VHF stations are at about 290 degrees so I get them backwards. All works fine in the daytime but in the evening I lose the VHF stations. the UHF stations continue as before. I am using a Channelmaster preamp on the mast to drive the coax down to the 3 TV locations. I'll go up and recheck all the connections later today, just wondering if anyone has any suggestions other than that. BTW the old antenna used to show some pixelation of the VHF signals in the evening but never a complete loss of signal such as I see now.