Well, judging from my ALA1530, which I have partially disassembled,
there is wire running inside the Aluminum so the aluminum is not the
loop. The indoor version doesn't have any aluminum on it either as far
as I can tell, just a plastic outer covering.

Rob


wrote:
The Wellbrook loops are not shielded. The exposed metal is the loop.

The 1530+ high bandwidth version looks ineresting. You could justify
the cost if you use it for FM broadcast. Otherwise, get the ALA 100 and
roll your own loop.