I am using Eggbeater antennas for both VHF and UHF. They are omnidirectional, so I can receive all satellites at the same time. I also tried Turnstile Moxon, did not see any difference from the Eggbeaters. For two-way QSO the best solution is to share directional the antennas between the transceiver and the SDR, e.g., using PTRX-9700.