Another idea would be to connect an rf voltmeter to the antenna connection and
just tune for max rf voltage.

I found THE solution to measure current flowing though a wire at high potential
without risks!

Solution is to use an Hall-effect transducer of the same type used in the newer
clamp meters (those able to measure both AC and DC currents). One can order
transducers with full-scale currents ranging from as low as 10mA to tens of
Amps. The high-potential wire passes through a hole having a diameter of two
centrimeners, so it is fully insulated from the measurement circuitry,

The transducer can directly drive a meter having a full-scale current of 20 mA
or less. See http://www.chenyang-ism.com/

73

Tony I0JX