With the circuit shown the receiver can pull in SSB/CW stations well from all over Europe on 40m (or 80m) with ease. It will be overloaded if there are strong AM stations nearby e.g. in the 41m broadcast band at night. If run from a 12-14V supply and R2 is increased to 5k6 or 6k8 the output will be louder and sensitivity close to -100dBm (about 2uV).
L1 is a small T50-2 (red) toroid with around 18-20 turns (40m) or 35-40t (80m) on the main winding connected to the FET with a single turn coupling loop for the antenna connection. The tap is about 20% up the main winding. C1 is adjusted to set the radio into the 40m band and C2 then acts as a fine tune within the band. You can check the frequency by listening to the frequency radiated when the stage is in oscillation. By changing L1 and C1/2 other HF bands like 80, 30 or 20m can be covered. Experiment! C4 is adjusted to get the circuit to just regenerate. There are no decouplers: these did not seem to matter, so were left out for simplicity. Increasing the drain resistor to 5k6 and running from a 12-14V supply will increase audio output.
For the FETer, an even simpler G3XBM 80m version of this transceiver, see the FETer page. So far the best day;ight DX with the FETer is 18kms.