If they are successful with some sort of most-flat-panel phased array that can talk to two or three satellites simultaneously, I don't think it will be quite as obvious on a roof as a 1.2m cheap small VSAT... But it will still need to be big enough to have sufficient gain for a real link budget, and CNR ratios for complex modulations.

And its EIRP to Tx to a satellite >300km away at bitrates of 0.5 Mbps or better will be easy to find with portable spectrum analyzers hooked up to directional horn antennas.