Aha, SATCOM, I've wanted to use AMSAT, but never have. Although I do SATCOM in my job every day, due to that, I have my fill of it. You can easily do EME with 500 watts at UHF with four long Yagi's. There are enough operators using high gain antennas to bridge the gap for smaller antenna systems, and four Yagi's on UHF isn't so bad for moonbounce, I knew a man who used four Yagi's on EME 432 MHz for years, but he also was able to rotate the polarity, that makes a huge difference. My 144 MHz array was H and V selectable polarity for TX and RX, but not completely steerable like his was.