I have an OLD radio shack antenna that has been unused and lying on the ground under my deck for about 10 years. I hooked it up to my 622 and now get ABC HD!!!!! With the antenna on the ground the highest siginal was 66, I laid it on my deck about 8 feet higher than the ground, still 66, I put it on my roof about 12 feet higher and STILL 66. I don't have a mast to mount it to but I'm wondering if 66 is the best it will do. Shouldn't the ~20' height gain (and no trees blocking the line of sight) increase my signal? The 66 seems ok but from I have read I wounder if 70+ may be better.