Good stuff Michael. Not sure about the decals, as I don't normally work in 1/72nd scale, but there's a good chance someone on the forum might have some spares.
As for the radio antenna wires, if this is a UK-based aircraft, they were on VHF by this period I believe, so there wouldn't be any wires, the antenna being either a di-pole or blade type. Hopefully someone with more knowledge of the type can advise. (The last photo posted is of a 'J' or 'L' version, without wires.)
Otherwise, if you have to fit the wires, use either very fine nylon thread from a pair of ladies tights, or 'invisible' mending thread. Drill a small hole in the central, rear frame of the canopy, and one in each fin leading edge. The thread might hold, and probably will, with ordinary polystyrene cement, or you can try superglue.
Fit the tip of a 'V' of thread into the canopy hole, after dipping it in the cement. If using 'superglue', mask around the area of the hole, preferably after giving it a coat of Future which has dried thoroughly, to prevent clouding from the glue.
Insert the 'V' of thread, and let it set - at least an hour for cement, 15 minutes for 'Superglue'.
The thread should be cut to at least twice the lengths required, to assist in handling.
Take one strand, and here you can use 'Superglue', and pull it taught against the hole in one fin. (This hole should be made as a notch, at a slight angle across the fin leading edge.). Apply a small drop of 'Superglue', off the tip of a pin or needle, onto the taught thread, in the notch, and retain the tension until it is set enough to release the grip on the thread - about 10 to 20 seconds probably, although allow a little longer.
Repeat this for the other fin and, after waiting about ten minutes, to allow the glue to fully harden, cut off the excess thread, and then, using a pair of nail clippers, get in close against the fin and snip off the remaining small tag of thread.
Any disturbance of the paint or glue mark can then be re-touched, hiding the joint.
Hope this helps.