I can easily pick up the nanovna's signal on my HF receiver, both audibly and on the waterfall display of my Icom IC-7610, which is more than 75 ft away from the rig's antenna(s). A small "rubber ducky" antenna is mounted on the nanovna "transmitter" that is inside the shack near the rig. I tested on multiple bands using 3 different antennas (EFHW, vertical, and yagi @ 60ft) and observed signal strength differences so I am confident the nanovna was radiating out through them and not somehow coupling into the closeby rig.
The best mode to listen on is CW because the VFO frequency matches the nanovna center frequency. The nanovna sweep bandwidth can be set from a few hundred Hz to a few hundred KHz and the rig's waterfall display (set to its highest speed) will show the repeating linear 101 point frequency ramp. Or you can select CW on the nanovna to output a single frequency too.
I also tried this on my Icom IC-9700 with a VHF antenna mounted above the yagi @ 60ft and picked up a very strong 146 MHz nanovna signal. I have no doubt that connecting the antennas to the nanovna (as is done when measuring SWR) will radiate a considerable distance. I am going to ask a few local hams to try picking up my nanovna signals and I'll comment about that later.
73,
Randy WB6UNG
Randy WB6UNG