This Nye Viking part # 250-0020-001 (9 x 2 inch diameter) 52 ohm low pass filter will help keep your HF transmitter harmonics out of local television receivers.
Comes with 2 UHF SO-239 female connectors to go between your HF transceiver and antenna. Includes the original box.
Asking $20 CAD, plus shipping outside the Calgary area.
If interested please email me at nrossairdrie at shaw.ca Mike VE6TC