I haven't given Aereo much thought, but it seems like, if I could rent a VPS in Miami, I could watch Miami Dolphins games online for the cost of Aereo plus the VPS. That would be like $30/mo for 5 months. $150 total -- much cheaper than the NFL Sunday Ticket.
I'm pretty sure they at least attempt to limit your antenna to one in a nearby area to you, though I'm not a customer, so I can't say how effectively they disallow it.
That said, I'm apparently in a suburb of Baltimore, and when I visit the aerio site, I only see access to Baltimore services... suggesting that I'd have a hard, if not impossible time getting an antenna in Miami.
That alone is a big loophole!!!