I think many people are using OpenWRT where detachable antennas are valuable, for point-to-point links, sector antennas, etc.
Post known-GOOD AND known-BAD hardware here and I'll update this top post! Please post as much info as you can, including antenna connector type, link to the router in the wiki, chipset, and any brief gotchas or quirks of the device.
Definition of "good"
Device is very well supported by Attitude Adjustment (12.09) or Barrier Breaker current release candidate
There are no known big performance problems with the device on OpenWRT
There are no functions that don't work on the device, but normally work on a well-supported device running OpenWRT
KNOWN GOOD for OpenWRT with detachable antennas
RP-SMA TP-LINK MR3220v2 (Atheros AR9331)
KNOWN BAD for OpenWRT with detachable antennas
RP-SMA D-Link DIR-655 (can't take open source firmware of any kind)
PARTIAL GOOD (some problems, see links if possible) with detachable antennas
RP-SMA Zyxel P-870HW-51a (wifi is based on BCM4318, which does not perform good in AP mode with the b43 driver)
Unknown status with detachable antennas
RP-SMA Rosewill RNXN360RT (loaded Barrier Breaker but full support uncertain)
(Last edited by normblop on 14 May 2014, 19:20)