Bad to signal on television

Just a quick question, I am having trouble watching broadcasts in the FOX channel on my Sanyo HDTV (in living room) The strange thing is that I have perfect signal in my bedroom a smaller Sharp hdtv. I am getting the signal from the antenna on the top of my roof, I don't have cable. Has anyone else had this problem? The picture will sometimes be perfect but then it will snap and degrade to standard definition in the middle of a football game or show, while my other tv is fine. It's not like the rooms are too far apart, at one point I began wondering if it were the tv and not the signal that is messing something up, any tips?

Have you got any external speakers or other devices near the problem tv, or near the antenna wiring to the problem tv? Could be interference from another electrical appliance that is causing the problems. Or even degradation of the wire that feeds that tv.

- Simon

I would "assume" you are splitting the antenna signal at some point to get it to both TVs? Where?

How long is the line from the antenna to the problem TV?

NOTE: Thread moved to appropriate forum. Not just anything goes in Anything Goes