Thanks Doug, I can actually almost understand that But of course, now we need specifics. In theory I should get a strong signal. I'm about 14 miles from the towers. Unfortunately my last HD receiver didn't have a signal meter so I can't give any real numbers. But the reception didn't seem great. I have a relatively short line to the receiver, probabably less than 30 feet. And the antenna itself is a monster, 131" boom and about 110" wide. But when I tried to split the signal one time things got worse. And when I tried to buy a cheap Radio Shack amp I basically got nothing. Obviously it introduced more noise to the system. Now maybe a better amp would have worked better. But it wasn't the cheapest one they had. But if I ever want to send the signal to more than 1 set I'll have to do something. Now, unless the guy that installed the antenna did a really lousy job, I can't imagine a 30' line would normally introduce much signal loss. It could be a multipath issue I suppose. But there are really no large buildings behind the antenna. So the first question I suppose is what would splitting a multipathed signal do? And, if I had a receiver with a strength meter, would I see a strong signal if it's multipathed? And of course, if it is multipathed, I don't think a pre-amp would do much good.