Radio,
It will be mentioned in the video, but the stubby antennas used for testing were a Comet "Miracle Baby" 800 MHz (which TrentBob supplied) and an unknown brand 1" stubby "racing" antenna that I purchased from eBay. The other antenna, which was used for the majority of the testing is a standard telescoping BNC antenna that ships with all modern base/mobile Uniden scanners. It's the one with the 90 degree pivot point. For our tests we kept the antenna fully collapsed, but attempted to extend it when we were plagued with LSM distortion, which did not help.
The yagi I use at home is an unknown brand, but I got it from eBay new for about $35 and it has 3 elements. It doesn't have to be a yagi with added gain, you're not trying to pull in distant stations (well, unless you are lol), the object is to simply isolate signals from one direction.
I do not wish to go into too much detail about the commercial radios I use, but I will state very clearly right now that none of my commercial radios have the ability to transmit or affiliate on any trunked system for obvious reasons. If you want to discuss commercial options, PM me your e-mail address and we can go into further detail.
I should also add that although our results are specific to the 3 systems we tested here in the Philadelphia area, these tests can serve as a general rule for any similar system. While there may be some variations in your area due to location, terrain, etc, you can expect similar performance from these scanners on any Smartnet, Phase I or Phase II system. All of the Phase I and Phase II systems use LSM (CQPSK emmissions), so LSM will be an issue regardless of which county you are in. Our point was to show just how bad or good one was over the other.
The video is encoding as we speak, and I will upload it to YouTube as soon as it is done encoding. I will post the link here when it's up!