No, you've got it wrong.
The cable from the outside end (nowadays on Baileys usually in the mains outlet socket) is wired to be adjacent to the aerial amp. It can the be connected to a spare outlet on the amp to fed a TV in the awning, or can be used in reverse to feed signal in from a bollard, from a satellite dish or external aerial to be used inside the caravan. However if it is used for bollard feed it needs to be connected.
Bollard feed is usually quite strong, so all that needs to be done is for the outside cable to be connected to the cable disconnected from the aerial amp that feeds the TV socket. It will require a F-type back-to-back socket adapter (often known as a barrel connector and usually supplied with the caravan) so that the bollard signal by-passes the amp. If the amp feeds more than one TV outlet and there is likelihood of both TVs being in use at the same time, then the white cable feeding the aerial amp input must be disconnected and replaced by the external cable BUT the amp gain must be turned to minimum to obviate the possibility of overloading the amp input. However note that in this last wiring method, removing the white cable will likely result in the radio failing to work as bollards don't usually provide a radio feed.