The Primary Obstacle is the Trees And Roof/s. The DB4e Must Have a better look at UHF channel 43. Here are some antenna mounts that will get the DB4e Up Higher.
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html. Get the DB4e with no amplifier HIGHER then roofs and get a good clear shot through the trees and UHF 43 will most likely be received.