Comet Handheld Scanner Antennas These Comet innovative handheld scanner antennas are small, but mighty! Their W100RX antennas can pull in the signals and the double fold-over hinge allows these antennas to fold down alongside your handheld--even while attached to your belt! The telescoping element has 8 sections including the base and extended length of about 40 in. overall. Its collapsed length is 8 in. including connector and hinge.