Found a brand new Engenius ENH220EXT Outdoor AP:
Firmware is d0gsh*t, just abominable. No idea what chipset it uses (probably Atheros), or if the board has easy JTAG access. If anyone else is interested I might crack it open. I found the datasheet: https://www.engeniusworks.com/datasheets/ENH220EXT.pdf
Nice features like PoE and waterproofing. The antennas are very solid and the enclosure is rugged. I think it's worth bricking :)!