No, I was referring to a matching network for a 75m/80m 1/2 wave, but the same idea, though I'd be worried about the cap handling the high voltage.
Insulate a 1/4wl for 80m? Mount the bottom of the mast on a wooden base on your roof and paint it with Plastidip if you're concerned about rain-proofing.
I am thinking about using 45' of small aluminum tower with a 15' stinger out of the top.
I need to get the feed point 20' above ground so I can install four ground radials and they will slope down to 10' at the ends.
That way all of the antenna will be above ground and not have to worry about any person or animal coming into contact with the radials.
I will get it figured out and start installing it, although ground mounted is much easier to do.
I isolated the last 1/4 wl 80 meter vert using 6X6 posts at the base and just fed it at the bottom of the tower.