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Measuring Video Transmitter (vTx) RF power and checking antenna performance are two things a lot of FPV'ers would like to do. ImmersionRC sells a nice RF Power Meter but its $150 USD price tag is a problem for most hobby budgets. But I have low cost solution for you. How about a DiY digital RF Power meter for less than $30 USD? Its 433MHz to 5.8GHz frequency range means it can handle all your FPV devices. Max input level is 0dBm, but much higher RF power is acceptable with an external attenuator (budget $20). And it can measure antenna VSWR if you add a RF Directional Coupler (budget $65