If so, who makes them?
Yes, there are. Extronics offers its iANT217 Circular Polarized UHF Omni Directional Rugged Antenna, while Tectus produces the ATEX Zone 2 / 22 UHF RFID Long Range Antenna TPA-UHF-270-LR. And Agillox offers three such antennas: the AGX 160Ex UHF, the
AGX 270Ex UHF and the AGX 245Ex UHF.
—Mark Roberti, Founder and Editor, RFID Journal
Can Active RFID Tags Be Read Inside of a Building or a Basement? »