After testing 6 different boxes, I’ve found one the holds the 3b/hat kit from pint size.me and allows for and external antenna.
The box is Amazon LMioEtool ABS Plastic Dustproof Waterproof IP65 Junction Box Hinged Shell Universal Electrical Project Enclosure Gray 5.9 x 5.9 x 3.5 inch (150 x 150 x 90mm)
I made a backer plate from a piece of roof strapping, so the magnets on the pi hold it in place



After testing 6 different boxes, I’ve found one the holds the 3b/hat kit from pint size.me and allows for and external antenna.
The box is Amazon LMioEtool ABS Plastic Dustproof Waterproof IP65 Junction Box Hinged Shell Universal Electrical Project Enclosure Gray 5.9 x 5.9 x 3.5 inch (150 x 150 x 90mm)
I made a backer plate from a piece of roof strapping, so the magnets on the pi hold it in place


