Update: Using "old faithful" (the aging, giant antenna I've had for about 10 years now), I cut the DirecTV AM21 box out of the equation by linking directly to my television (and using it's built-in tuner). It tuned everything. I found a signal strength gauge hidden deep within the TV's menu system and took note of each of the local WPB station strengths. VHF 5 & 12 were weakest but it is a UHF antenna with some high VHF pull, so no surprise. I made a note of individual channel signal strengths.
Then, I put the Clearstream 5 up on the same pole, angled it in the same direction (strongest signals based on using old faithful and the rotor). My expectations were that the "5" would improve upon the pull of the two VHF stations but I wondered how it would do with UHF as well. Relative size difference was huge so, if it did well, I was thinking of taking down the monster and just using the "5" going forward. Unfortunately, I could never even get a VHF signal with the "5". The nearby UHF stations came in but their relative strength per the TV signal meter was about half of what it was with the old antenna. Maybe size does matter
My main purpose in trying the "5" was in the hopes that VHF 5 & 12 could be improved in terms of stable signal. This was before I figured out that the AM21 was going bad (doing some research online, I've come to realize that this is a very common fault with this particular DirecTV hardware). So, after trying a lot of different things trying to make the "5" go, I hooked everything back up as it was and ordered another AM21. I've got pretty strong signals with all of the local channels using the old antenna but the existing AM21 can only tune a few of them (it used to tune everything a few months ago; the fade is what made me jump to the wrong conclusion the the old antenna was showing it's age). Per online info, it appears that the AM21 just degrades over time and replacements are the only option (I wish I could get an AM21 with the TV's tuner chips in it; they really grab the signals). Too bad. I was hoping the "5" would work well for me.Edited by HobeSoundDarryl - 5/4/13 at 9:12pm