I made a db4 antenna and having trouble I hooked it up and have 5 great channels and 3 channels the tv says 100 percent in signal but nothing in the snr(db) the other 5 have about 21snr and the signal is 77 percent what do I need to do? I live in tilden Ne 68781 what am I doing wrong getting so fusterated thank you for any and all help.