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Message: <blockquote data-quote="Terryl" data-source="post: 1046855" data-attributes="member: 369937">Also the coax used is for TV and satellite signals, it's 75 ohm, I think (check you input spec's for your dongle) it needs to be 50 ohm cable, if so then your loosing 2 to 3 dB on your incoming RF to the dongle.Now 3 dB does not sound like much but it the RF world its 1/2 of the available signal.If the incoming signal was 1 micro watt or -30 dBM at the antenna output, (micro watt or dBM used for RF signal measurement) and you had a -3 dB of loss due to an impedance miss-match you would have .5 micro watts or -33 dBM at the dongle, add the coax attenuation at 137 MHz and it total lenght, the incoming signal can be below the receive threshold for the dongle.</blockquote>