There literally are, there's very good declassified evidence that has leaked out periodically in small pieces since the mid 1980s that some of what the NSA has are very large satellites with big unfolding umbrella-like antennas aimed directly down at the ground. For SIGINT collection and analysis. Or possibly some combination overlap between the black budget parts of the NRO and NSA.

Same size satellite bus as the largest class of things you would see in geostationary orbit (approx 6500 kg and the size of a school bus) but in high inclination orbits around 600 km.