Actually, his name is Jack and he runs Cowley Electrical out of Moruya Heads. He was quick and efficient and had the antenna on the roof and the box on the wall before I had even finished my breakfast. Thanks, Jack!
And this is what the new "communication centre" looks like:
Is it working? The answer is a "no" and a "yes": the phone line is still not working (who would want to ring me anyway?) but the broadband is working perfectly well, with great reception as far away as the guest cottage and the "Library" and even right down to the "Clubhouse" by the pond.
And visiting yachties can use it even if anchored on the far side of the river (after they've joined the Nelligen Yacht Club, of course!)