First try usually does the trick, just make sure of the ISS's visibility to the antenna, I use a Skeleton Slot 6x6, and 15 watts, it works fine.
Percy, ZS4RA
As I use my antenna on my balcony it takes me several passes until I can find a good oportunity to upload or download messages from ISS PMS. I also suffer from a strong interference on VHF from a cable operator that degradates the quality of the signal. For Packet this is very critical. So I consider a complete upload or download a big success for me.
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