I recently purchased a Diamond RH77CA antenna to try out on my various scanners. My Pro-164 seems to overload with this setup and does not work right. My BC92XLT works good with this antenna and pulls in some strong signals. But......then I put it on the PSR-100 and it's like it was made for this scanner, words can't describe how it works on this radio. I'm pulling in signals from 50 miles away crystal clear, it's like the ultimate combination. Now I realize not many people have this scanner as it's just your basic analog radio, but it's all I need as i live where no trunking or digital signals are present. So if anyone is using a PSR-100, do yourself a very big favor and pick up a Diamond. You won't be sorry. Just my honest opinion!