If I remember correctly, Channel TV sent someone to London with a van, to collect videos and films from Thames TV and/or LWT, and brought these copies back to the Channel Islands, so they could broadcast them. In addition, every day, someone from the news department was sent in a car to the most northerly point on Jersey, from what I can remember reading, and they would use their car radio to pick up the radio signals from the mainland. They would then note down the main national and international news stories, and would later, return to the Channel TV studios, and the copy that they wrote down would form the basis for the national and international news.
The strike does lead me to ask this question; what happened with regards to advertising? In 1979, Channel took a dirty feed from Westward, and the latter showed the national adverts, such as for Saab cars, levis jeans, with Channel opting out only to screen local advertising. What sort of advertising did Channel show during the strike? Did they only screen adverts for local firms, or were ads for larger firms shown as well?
They could have just listened to the BBC radio news bulletins which were broadcast on the island from their own transmitters, and no one would really know, if they just re-edited them for reading? Could have saved a bit of effort?
With regards to advertising, I presume it was just local advertising that was on Channel Television, as there were no connection at all to the network through the strike.