130 Brigade had a Signals Section. If he was with them as they entered Normandy then one of the three beaches mentioned is correct. The brigade was part of 43 (Wessex) Division which joined Second Army in Normandy). Looking at what they did subsequently, of the three I would guess Sword, nearest to Ouistreham.
There are a couple of books on the 43 Division which your local library may be able to get? One is on Ebay - "The fighting Wessex Wyverns" for £4.94 which should give the answer.
I've found reference elsewhere to someone who has the 43 Div history - I'll contact him and see if I can get a more specific answer.
If I may, I'd suggest you also visit the two American beaches further to the west to compare the type of ground behind the different beaches.
(In December it looks as if he has gone to the Far East to an Indian Infantry Brigade)
MaxD
PS John's thought about the Mulberry harbours would mean landings at Gold, the furthest west of the three (I have discounted the ones at Omaha beach). The history may help us.