Trouble is, the femtocell wanted a network connection, and our RF chamber didn't have an RJ45 passthrough. Some emails got sent, the chamber vendor could sell us a new passthrough module but it was on backorder, ETA two months or something.
So the following evening, I swung by the e-waste recycler where I used to volunteer years prior, which meant I could just give the proprietor a wave and then let myself into the back room and pick the pile. And sure enough, I found a couple of 8-port 10base-T ethernet hubs, with 10base-2 connections on the back for connection to a coax segment. I talked him up to twenty bucks so I'd have an expense to submit; the company did not deserve to get this for free.
Back in the RF lab the following day, it was a trivial matter to convert the BNC connector on the hubs to the N connector in the chamber wall, locate one of the hubs inside the chamber, and connect the femtocell to it. The one outside got the internet connection, which had been running at gigabit speeds but now found itself negotiating at 10/half! (I wonder if the campus networking folks get alerts when that happens. Because it's almost surely not what's intended, unless I'm around.)
The younger techs in the lab mere MYSTIFIED at this exotic hardware that could send Ethernet signals over coaxial cable! That must be expensive! How did you come up with it so fast! Whoever made that must've had this application in mind, but what a niche application! Amazing!