Each Flexcomm™ Transceiver installation requires an antenna. We supply several different antennas for the RT-5000 that cover the whole 29.7 to 960 MHz frequency range of the Transceiver. If antenna height is a critical factor, the AT- 5000 should be specified since it is only 5.5” tall. For the best performance overall, we suggest the 9.5” AT-560. If your application does not require long range operation below 120 MHz, the AT-160 will work very well at considerably lower cost. It is a passive multiband antenna with the same dimensions as the AT-560.