Dorne & Margolin has designed a series of high isolation, very low power loss antenna hybrid couplers to provide multiple system operation from one antenna. For proper system operation, we recommend using only system-tested Dorne & Margolin couplers along with our antennas.
 

108 - 118 MHz Frequency Band
Dual VOR or dual marker beacon. Will permit operation of two NAV receivers from one VOR antenna or two marker beacon receivers from one marker beacon antenna.
VSWR: 1.5:1
WEIGHT: 0.25 lbs.
P/N: DM H21-1