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Old 9-May-2012, 1:02 AM   #4
Senior Member
Join Date: Aug 2011
Location: USA Gulf South
Posts: 231
A Hall sensor is a very sensitive magnetic-field sensor. This makes a Hall sensor-based compass a magnetic compass. I would be concerned about its accuracy in or near steel structures. That said, directional accuracy is not critical when aiming a TV antenna. The recommended direction is the starting point for manually optimizing your reception.

If direction is critical, then GPS is the choice 100 times out of 100 over magnetic when those are your options.
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