Last night there was a power outage at home. I was able to see a LOT of stations on 20M (FT8). As soon power returned, all of them disappeared. You can see in the waterfall very clearly when power returned:
The odd thing is, noise is around 7 here at home. But when power went out it dropped only to 6.
Also, today I went to my dad's and he was seeing lots and lots of stations. I left WSJT-X open, and when I came back, there were only two decodes, out of dozens at his place.
I'm not sure what's going on. My antenna is a dipole, tuned to the right frequency. Measures SWR 1.1. My rig is a Kenwood TS-450S. My dad's antenna is also a dipole, and his rig is an Icom IC-765. We're only 700m apart.
I've tried adding a balun and a choke. The choke made a big difference by dropping the noise levels by 1.
What can I do to troubleshoot this?