When searching for a scheme for a HF probe, I found a good working solution at https://elektronikbasteln.pl7.de/signalverfolger-fuer-nf-und-hf-selbst-gebaut.
The scheme uses two germanium rectifiers and looks like this:
I tried that HP probe schema with good results. The original uses 2 diodes AA118, I have used AA143.
In the next images, we can see a 25 MHz signal, AM-modulated with a 1 KHz signal. This signal is generated by my frequency generator oldie WF PG1 Prüfgenerator.
Finally, I moved to a 200 Mhz signal.
The probe schema tested is simple and can demodulate signals in a wide frequency range.