I've got, for the near term, limited resources to put up an HF antenna at my home. One of the options I can manage without excessive cost is a loop, which would enclose the house. I need to transmit on 80m, and likely up to 20m (I understand loops are very tolerant of shorter wavelengths). It wouldn't be as high as I'd like, so would probably perform more like an NVIS, with poor horizontal radiation (given I live in a draw, that's not entirely a bad thing, as less of my energy will go into the ground where it rises).
The only thing is, the space I have pretty much requires the loop to enclose the house, if I'm to avoid entanglements in the dense pine/hardwood mix that covers more than half the lot. How will the steel roof (about 5x20 meters) affect the radiation of an 80m loop (probably hexagonal), mounted close to roof height (roundly 3 meters above ground)?
I'm not certain of the grounding status of the roof panels; it was applied by a "handyman" who seems to do no better work than is expected of him (that is, if you don't know it's wrong, he won't do it right), before I lived in the house.
Here's the property aerial view; the bright white roof with two extensions is mine. The property line follows the fence parallel with the driveway, the near edge of the line of trees next to the plowed field North of the house, and loops into the heavily treed area S and SSE (mix of pines and hardwoods, tangled branches, difficult to run wire into).
As requested in chat, here are photos of the trees that have reasonably open space nearby -- as noted, a mix of pines and hardwoods.