This is the antenna: https://www.amazon.com/dp/B08LVYTL5V

I doubt that I could transmit with this, but I could be wrong. It's not something I've investigated.

It says maximum power 250mW so it looks like you could do really low QRP with it. I do wonder if you'd get a signal out from your apartment though.

Wow! That surprises me, and I probably never would have checked, so thanks. I think of FT8 as deep magic at this point, so it wouldn't surprise me if that's enough to reach pretty far

You basically just need any sort of wire to receive. FT8 is a very weak signal mode so I wouldn't be surprised if you string up some speaker wire inside and still hear signals.

For listening, you can pretty much just throw some wire up and you'll hear stuff. When I first started, I got an RTL-SDR, and with alligator clips, added some random wire I had to the dipole antenna that came with the RTL-SDR. I was able to hear some FT8 signals from overseas. Helped that I lived in a top-floor apartment, but still :)