Will a dish antenna with good range generally offer any improvement where their is no clear line of sight (trees mostly) and may be one small area that has throughput signal? Already tried a home made parabola, am getting a connection,but only intermittently and has to be pointed just right to get that. Can a small dish antenna be aimed manually-is that possible-the supplier suggests using a monitor to aim it. This is to a free signal but I have no control over the transmitter.