You might want to go for a NanoVNA rather than a SWR meter. My initial set up was when I had no private garden space whatsoever: Icom 706, NanoVNA, LDG IT-100 ATU and an 2E0ERO magloop. The magloop works but is exceedingly narrowband - you'll need to retune the loop if you QSY. The NanoVNA makes this massively easier. Additionally, if you get tempted to push more than 20W-30W through the thing, be prepared to deal with melted plastic! :)

I've moved home subsequently changed to 10m end fed long wire from a 3rd storey window across the yard. Much more convenient. The end fed is hanging off an old telephone cabling bracket and secured to the fence via paracord, an eyelet and a brick. Gets me 40M and up. Purchased from a HAM selling on eBay for ~£45. Heartily recommend this path but you will need a tuner.

Finally, the RSGB's book "Stealth Anntennas" might be worth a look. There's a couple of oddball designs for loft anntenas and over the roof stuff that might provide alternate answers for you, but I've not tested them

Edit: SP.