I've just acquired what is said to be a GAP vertical antenna. I have assembled it, but it isn't much like any of the antennas on the Gap site, although the details are similar. It's much simpler than the present models. It is 10 metres long, 30 mm diameter aluminium, with a white plastic cap on the top. On insulating brackets, it has two smaller diameter elements, one 4.280 metres long, the other 2.180 metres (adjustable), each with a wire from the bottom going to the connecting screws on the gap insulator halfway up. The coaxial cable is yellow, as used by Gap. Does anyone recognize it? Know the bands it's good for? Should it just stand on the ground, or be clamped with insulated U-bolts??