My brother was given a Hi Gain Penetrator, new in the box. He has an A-99 on his tower at present and thought about purchasing an Imax 2000. He was wondering if he should replace the A-99 with this penetrator 500 instead? I had one of these back in the mid 80's and it worked well as long as you sealed the joints to keep the water out. Anyone have some info on how the penetrator should perform against the newer antennas? Also, he lives in a hollow where he has hill obstructions. Thanks in advance