In these days I began to use the transistor having ft over 1GHz. They can make gain over 40dB when they are used on IF amplifier. They can oscillate over 100MHz direct. You can believe that when you make this machine. This machine is a simple single conversion receiver.
Oscillator is made with varicap in order to avoid the body effect.
But as a radio for SWL, It do not makes any problem. This is a basic usage of circuit of this FET transistor. IF amplifier has 40dB gain only with 1 transistor. FM detector is called as Wise detector. The characteristic is shown on the fig.3.