A Google search says that 1.25" EMT should have a wall thickness of .065" which should be around 16 gauge.
http://www.westerntube.com/electrica...lic_tubing.htm If you need something heavier , there's also 1.25" IMT (.095 nominal wall thickness) or 1.25" RSC (.133"), both of which are approx 1.5" to 1.7" in OD.
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FYI, ALL of our outdoor antennas feature mast clamps that can accept up to a 2" OD mast.
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Updating this as our new DB8e is an exception. It will fit up to a 1.75" OD mast, a change necessitated by the mounting hardware scheme and the combiner box that was used.