Hi, I was wondering about getting a pre-amplifier. I live in Lincoln, NE and have recently lost reception to my 3 pbs channels as they have made the switch to dtv. I am guessing by the time all my locals make the switch I may lose a few more as they may not broadcast with enough power. I have a channel master 4221 antenna hanging from my ceiling in the corner of my living room (I know that's not the best place). My questions is whether or not I should get a pre-amp and mount it directly to the antenna, or if you think I would gain enough reception by mounting the antenna about 8 feet higher on my old satellite mast that is on my porch roof? I get all the omaha/lincoln channels, but for some reason cannot tune into pbs. Any help would be appreciated.