I see two white cables in there. One has 3 wires, and the other has two. From the pictures regarding the RF switcher, the 2 wire white cable is the antenna cable, and the 3 wire one definitely "looks" like main cable. It actually looks like house wiring cable!
A photo of the bottom and a photo of the back, where the cables go into the unit would be nice, when you have time.
Amiga 4000: Apollo Turbo 040, 128MB Fast, 40gb HDD, CD-ROM (needs internet)
C64: 1541U-II, MixSID, WiFi, LumaFix64
ZX Spec, A1200, CD32, MacPlus/SE, A500, BBC Turbo Master (NASA), 2600, Acorn 4000, VIC-20, IBM 5155, GameBoy