Professional 40-20-10-6m 4 Band Multiband Windom Antenna Amateur Radio Ham SL16 1. The design was optimized for portable outdoor utilizing a lightweight balun support,nylon end insulators 2. An erected height of 6-7 meters(19-22 feet) is appropriate,lower height will affect the antenna voltage standing wave ratio(VSWR) 3. The WA-4 has bullet style quick connects at both ends and is supplied with 2 matching terminal 4. These can be used to add wire to the overall antenna to fine tune the VSWR if needed