How to measure microwave frequency with Lecher lines
I don't think that this will work with an analogue meter of the type you have shown. Have you checked that this meter isn't a moving coil meter (one only suitable for DC measurements) or, if indeed it is a moving iron meter, then what sort of frequency response does it have. I doubt that a moving iron meter of the type shown will respond adequately to 10 kHz let alone 10 GHz.