If you choose to go with the Winegard HD7698P antenna then use a Winegard AP8700 preamp with 2 Tv's. If you can position the antenna or antennas on the roof so that there is a gap in the trees in the direction of 74 to 88 degree magnetic compass then that will help. I am not saying that the trees will prevent a signal from being received , it's better if the trees are not there. I suggest these roof top Tv antenna mounts , tripod roof top mount , chimney mount , peak of the roof eave mount. Do not mount the antenna in such a way that you are doing monkey swinging manuvers and you fall off the roof. Do not try and mount the antenna higher and higher and higher and higher until finally the whole thing is unsafe and it will fall down. When GUM says get it above the trees , this motivates people to do some real crazy action. When you have the antenna or antennas up , you can point the Tv antennae in the directions of 275 and 302 and see how the reception is of those directions. Here are places to buy Tv Antenna and etc. ,
http://www.3starinc.com ,
http://www.solidsignal.com ,
http://www.starkelectronic.com ,
http://www.amazon.com