I recently built up one of NZ1J's RDF sniffers. Here's a youtube of it in action:
I had 10 of these PCBs made. I planned to distribute them to whomever wanted to build one up. I only had the PCBs, not the components.
Lisa, K6LNE, has offered to order the components needed to build up all 10 PCBs, so they will be available as complete kits to build the PCB. Note this is just for the PCB, not for the wooden frame, antennas, speaker coil, etc. The cost for the PCB and PCB components is $15. We have permission from Dave, NZ1J, the designer of this PCB to distribute these kits.
So far 4 of these 10 boards/kits have been spoken for ( WB8ZXU, K6LNE, K7XWZ, KK7FYG ). If you would like one of the remaining 6 kits, please email me. I expect they will be available in a few weeks.
Thanks to Lisa for all the work put into this.