WSPR can produce some surprising results. These screenshots of the hourly contacts come from using just an FT817ND QRP transceiver at 500mW output with a far from efficient antenna. It’s called weak signal for a reason.
I will be adding more about WSPR as time permits. More home-brew transmitting antennas – I plan to construct a loaded dipole for 20m based on the whip and maybe a loop if I can figure out an unobtrusive layout for one. Some testing with a cheap HF receiver – a Realistic DX-394 which can be had secondhand on eBay for around £70 or so delivered fed by a PA0RDT active HF antenna. Maybe a page on my home constructed QRP beacon too.