$30
This Nye Viking Model 020-001 50 ohm low pass filter has over 65 dB of attenuation above 57 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.
See https://www.universal-radio.com/catalog//hamacc/2018.html
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