This 1:1 ratio current Balun is the best for feedline isolation and choking. If you have a yagi you should be using one to balance the power to the driven elements and prevent the coax feedline from distorting your radiated pattern.
This Balun has a black mounting clamp for mounting on a square or round boom from a Beam.
Also we have a pressure equalizer for ventilation so that condensation is excluded.
Designed for those who want the maximum isolation and choking across the full HF spectrum.
This Balun has two 2 cores in a stacked configuration to maximize choking impedance on HF bands from 1- 30MHz.
Transformation and power handling (up to 5KW) are excellent while providing a choking impedance that exceeds 8000 ohms.
Even on 160 m the choking impedance is 2000 ohms, and 3300 ohms on 10 meter.
Enclosure : Polycarbonate IP67, 100% UV resistant.
RG400: Teflon, double shielded.
SO239 Connector : Silverplated.
All hardware Stainless steel.