I'm in a 2500SF end unit townhome now where all the grass, landscaping, external maintenance and snow removal is done for me because I can't do that anymore. I have plenty of trees I can launch wires into and will be doing that this spring. I thought I could design an efficient enough attic antenna to get on the air with but it's not working out as well as I'd hoped. I'm good 6-20m with an MFJ 1836H up in the attic and that works well but I really enjoy 40m and 75m the most so I have to launch some wires into the trees for that.
Over the winter I got my coax for the 1836H from the attic to the basement and got the 220/50a service for the Amlifier done and tested, so that's good. I just miss all my friends on 40m (OMISS Net, among others) and some of the locals on 75m. I'll get there. :-)
Good for you. Btw, I can talk/listen planet wide and it's much easier with my vertical antennas. But I mostly listen nowadays, cruising the bands in the evening.
Sounds like an end-fed halfwave would be a good antenna choice for you.
Running power you will need to use 3 cores, maybe 4.
I use FT240-43 Ferrite cores.
https://www.amazon.com/s?k=FT240-43&i=industrial&ref=nb_sb_noss
See the “Real End Fed Half Wave Antennas” group.
https://www.facebook.com/groups/122528211696742/?multi_permalinks=887360081880214