I have a large directional uhf/vhf antenna w/ pre amp mounted @ 20' aimed E.N.E. directly @ WMYA transmitter within 50 miles and can't pull in. However, I pull WLOS (85 miles) down to WNEH strong all day long. all my stations are well within 90 degrees. The only time I ever find WMYA is after aiming W.N.W. ??? Of course I begin losing many others. I am wondering if L.O.S. signal is blocked and redirected or if I need better amp. any help would be greatly appreciated.