The SN-UL-AK20L-IND is a 900MHz external antenna kit which connects to base stations for EnGenius DuraFon or FreeStyl phone systems. It includes 20-meters of LMR-400 cable.
EnGenius SN-UL-AK20L-IND - phone antenna is rated 3.0 out of 5 by 1.
Rated 3 out of 5 by phoneguy7 from Well made and does the job but a lot of money if all you need is the 6dB extensionI have installed several of these on existing Durafon Pro bases and there has been a definite improvement in coverage especially inside buildings and vehicles. However as I already had the normal antennae I was really just paying for the 6dB whip (the long black rod that screws into the top of the existing antennae).