It's a "leaky coax" installation. You hook up the cable that purposely leaks RF signal (split shield as mentioned) to a particular area in a building. It's used a lot in emergency situations and stairwells for fire and rescue workers so cell phones or 800Mhz radios work in times of need. It can be implemented for almost any RF application.

Pretty interesting concept actually.


_ _ _ _ _ _ _ __ _ _ _ _ _ _ _