Trees and tree leaves do a great job of , absorbing , reducing , or blocking Tv transmissions.
How many stories tall is the neighbors house??
Install a Winegard HD7696P antenna with a Channel Master CM7778 preamp , mounted - High Up - aimed at about 40 degrees magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Avoid aiming into trees and into the neighbors house.
Is there a place on the roof of your house or some where else that will avoid aiming in to trees and the neighbors house , or has the least amount of obsticals in the way of reception to the north east at about , 21 degree to 62 degree magnetic compass directions??
--> Also how many Tv's are/will be connected??<--