For those that enjoy endfed antennas but want to run more power, Balun Designs now offers an excellent alternative. Built with the same craftsmanship as all our other units, this new model will allow you to either replace your current matching unit or construct a new higher power end fed half wave antenna. We have also installed an additional stud which can be used for a separate counterpoise wire rather than forcing the use of the feedline’s coax shield.
In addition, this model provides both a 49:1 ratio PLUS a 64:1 ratio for those who find their particular installation has a higher feedpoint impedance. Please note that both ratios cannot be connected to an antenna at the same time.
Attaching a counterpoise wire to the common point of the auto-transformer provides the antenna radiator something to push against rather than the coax shield. The counterpoise wire does not have to be similar in length to the main radiator wire and just a short wire is all that is needed, about 0.05 λ. This calculates to ≈ 4.2 m or ≈14 ft for an 80m end-fed.