R1,R2,R3 = 51 ohm 2 watt non inductive.
R4 = 1K ohm 2 watt.
RV1 = 10K ohm linear control or pre-set control.
D1 = OA91 type diode.
C1 = 0.001 uF ceramic disc.
C2 = 0.01 uF ceramic disc.
S1 = 4-pole 3-way switch ( Maplins)
Meter = 1Ma or less.
2 SO239 antenna sockets.
Suitable metal box or case.
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