This Avanti low pass TVI filter's 3 dB cutoff is at 43 Mhz with 80 dB of attenuation at 54 Mhz to 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. 

Asking $15 CAD, plus shipping outside the Calgary area. 

If interested please email me at nrossairdrie at shaw.ca  Mike VE6TC