"Dave Plowman (News)" wrote in message
...
Been doing some checks. Each section of the stand (made from Speedframe)
does seem to be electrically insulated from others - due to the plastic
sleeves in the joints. Even although the joints are made of steel.

So what we effectively had was two bits of approx 6" long 1" square tube
bolted to the mounting brackets of the X/O, and making a reasonable
electrical connection. Forming if you want an 'H' shape. Wonder if this
was acting like an aerial?

Very likely.

Picking up gawd knows what, of course.

The hash from some switch mode power supply somewhere.