The DB4e is a directional antenna and is excellent for reception of UHF Tv channels. A step up is , CM4228HD , HD9095P , 91XG , HD7698P. And stacking antennas. However for your reception situation I suspect that if the DB4e is not receiving the channel then the other antennas will not. You can try the Blonder Tongue preamplifier. Or get a Channel 43 band pass filter from Tinlee and a CPA-19 preamp from Antennas Direct. However the main situation at your location is the trees and roofs. You can cut tree branches away and make BIG hole for the signal to get to the antenna. Also using a Tree Mount , a antenna can be mounted on a tree on the Other Side Of The Trees so the trees are not reducing reception , the DB4e and HD9095P both mount at the back of the antenna so will work better with a tree mount.
http://www.ronard.com/tree_adjust.html. Buy ronard mounts at solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.
http://www.solidsignal.com