With a BFR96 you can make oscillators in the GHz range. With a simple setup I could generate signals up till 1.3 GHz.
I used SDRsharp as a "poor man's" spectrum analyser to view the spectrum.
Here you see the generator makes a (very unstable) 1.28 GHz signal:
Circuit diagram; I used a BFR96 (that has a transition frequency of 4.5 GHz) instead of the BFR92 (transition frequency 5 GHz). DC voltage connected to R21 is 9Vdc.