These dime-sized, tiny antennas are part of what makes it possible for Aereo to stream live
As part of the service, every subscriber rents a pair of those tiny antennas so they can watch live TV while recording another show, or watch live TV on two different devices at the same time.
Here's a close look at the antennas (the image below is a graphic):
Head on over to GigaOm to check out real-life images of the antennas and other aspects of Aereo's operations.