Hi There,
Oooooh not seen a lash up like that for a while.
Quite possibly the following...
The black tubular thing centre stage is a cigar power plug and taped-up socket 'bodge' to provide power to a device connected to the thin black twin cable that disappears into the dash - source power taken from the broadcast radio power plug. The black box looks like a passive device used to share a single dual band antenna between a cell phone/CB/two way radio and a broadcast radio. The big loop of coax will go to the cell phone/other device and the wire exiting from the black box down off the bottom of the screen would go to the broadcast radio antenna socket (but I can't see the connector on that one.)
All the best
Steve