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Message: <blockquote data-quote="Terryl" data-source="post: 1048681" data-attributes="member: 369937">And your using this filtered pre-amp?And still getting the interference?Then it could be direct RF radiation into the dongle, there could be a break in the shielding somewhere... OH Is the shielding grounded??? that could make a big difference, a standard TV coax ground block (if you used 75 ohm TV coax) can be used to ground the coax shielding, without a good ground it can act as an antenna and pick up high levels of RF that may be close by.I would suggest using one and a ground rod driven in right at the antenna.(ground the antenna mast also)</blockquote>