Needed to sort out the palcement of the aerial today. This was a bit of a conundrum until I read the manuals associaited with the AFS Magnetometers.
As long as any metallic objects are non-moving they are okif within 24". The aerial defintely is within 24" and is approx 12" away from each of the magnetometers, however is definitely non-moving metallic parts.
As such, placement is in a good position for exposure and ease of access.