High Frequency Rectification
The task of measuring an amplitude of a powerful RF signal is usually accomplished by means of so-called "demodulating logarithmic amplifier", or "RF power detector". An example would be LTC5505, ADL5505, AD8313, or similar. Usually the RF transmission line has either a high-impedance DC-blocking decoupler,



or a directional coupler based on stripline technology:



The output of the RF detectors is usually used as a feedback for RF power generator, to maintain stable power level of transmission.

To measure the frequency you would need an additional block. You need to fork the signal into an small RF amplifier and use a fast counter.