David,
I live in Coconut Creek, Fl. I just recently put up (two days ago) an OTA antenna. It was rainy that day (smart putting up an antenna in the rain ... I know.... but I had to have it), but I aimed it best I could getting levels of just over 70 for channels 10 and 7. I got levels of near 80 for channles 2 and 4. All seemed fine that day, however the next day I noticed that channel 2 and 4 come in relaly good (although 2 blacks out once in a while) but 7 and 10 are much worse (especially 10). I noticed that my antenna was pointing SouthWest, which is contrary to where the towers are. I guess what happened is that there was some kind of skip or something happening, and for some strange reason I was getting a stringer signal pointing away from the tower, rather than right at it.... I am hoping that it had something to do with the poor weather conditions. So on wednesday I will re-aim the antenna and see what I can get the levels up to. BTW, the levels I am talking about are from my Sony Sat-HD100. It gives me signal strength meters for each channel.
For an antenna I purchased a Wineguard antenna specifically made for South Florida. I got it at a place in Miami who sells them 2 in a box for $50. Pretty cheap for an antenna, and it's made just for us. I had a friend who wanted one also, so it cost me only $25. (but even at $50 if it works who cares).
I'll let you know what I come up with in a follow-up post, but I should be able to lock them in. Although I dont know about channel 10.... are they not at full power yet? Not sure....
GuitarJ