Chosen Solution
Yes these three wires are the antenna coax lines. Two are for WiFI the third is the Bluetooth. Can you post a nice tight and in focused picture of the damaged cable and the connector if it’s loose. So we can see if it’s salvageable. Otherwise you have a bit of work to replace the cable. Tracing the line back to the antenna unit so we can ID which is needed as the length of the cables are different.
iMac Intel 27" EMC 2429 AirPort Card Replacement Buy a new part and fit it.
