Taking them in order; a transceiver antenna isn't all that visible to the casual observer, and the ones who look more closely should understand that a transceiver is a necessary item of kit, not a 'fancy add-on'. By the wind-vane, I assume that you mean the gadgets that the racing charleys put up there to tell them which way the wind is coming from. I personally think that if you can't feel which way the wind is coming from you should get a motor-boat or perhaps even stay ashore. As for fine tuning, the behaviour of the sails will tell you that. With the radar reflector, I would go for one of those radar alarms, which pick up the prescence of a ship's radar beam. Then use your spare halyard to hoist a reflector, so that your boat appears on their screen. There was an article in YM or PBO many years ago showing how to construct a demountable radar reflector from four sheets of aluminium which slot together. If I can find a print of it, I'll pass it to Steffan to be republished. It's the sort of thing which should be re-published often. Peter.