> A dual loop magnetic system would probably be

Thanks, I'll look into this

> Only thing that might be a problem is the coupled magnetic fields...
> but this depends on what is in the environment.

Car bodies and people. Lots of 'em

I wondered how far I could get with this, as I remember Tony
Nixon's ID badge problem. I think Peter Peres said that any
radio used would go through walls floors and ceilings, hence
my question as to whether you really can restrict RF to limits
at low cost and low fuss

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