I would expect the "uplink" information to be relevant, as most satellite antennas are used for receiving only (those private tv reception antennas). Do not counter this with "not sufficiently relevant for mapping", as you'll see people will likely tag it ;-)
Subtagging (or a property) seems better for the "uplink" information, because it doesn't require people to know the details in order to map something, I agree. Cheers, Martin
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