Wow, these things are obscenely tall, and look like they use some sort of proprietary connector?

Where I have the router mounted means that when I have the antennas on, it prevents my door from opening all the way.  No issues with my old router, but these new un-adjustable antennas are just so unbearable, I'm using the router without them right now.  Obviously, this greatly affects the signal range.

Short of returning this for a completely different router, I'd like to just put a different antenna set on them.

Unfortunately, the BNC connector seems to be some sort of proprietary connector?  Or maybe I'm just not well versed in wireless antenna connectors.

Anyone have a clue of what the connector type is so I can buy some adjustable replacement antennas?