Reddit reviews Master Magnetics Round Base Magnet - Magnetic Fastener/Magnets with Holes, 2.04” Diameter, 1.25” Total Height, Holds 35 Pounds (Box of 5) RB50B3NX5
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INDUSTRIAL MAGNETIC MOUNTS: Featuring ceramic magnets composed of iron oxide and strontium carbonate, a low-cost alternative to metal magnetsSTRONG, ROUND BASE MAGNETS: Complete with a bolt stud and nuts strong enough for commercial use. These magnets can be used in areas with temperatures between -10° F and 200° F.MULTIFUNCTIONAL MAGNETS WITH HOLES: Powerful, low-profile magnets with attachment hole in center. Attach a hook or knob to position or hold inspection equipment, indicator gauges, lamps, signs, antennas and more.DURABLE AND STRONG MAGNETIC FASTENERS: Nickel/chrome-plated for durability, these pot magnets have 35 pounds pull apiece on a thick, flat and smooth plate (magnetic on one side only).PRODUCT DIMENSIONS: The overall diameter of these Master Magnetics round base magnets is 2.04 inches. The total height of each magnet is 1.25 inches. The bolt on each magnet is a 10-24 x 1-inch stud. Pack of 5.
It's been done for water towers as well. You just need to spec the magnets to have high enough force to withstand movement from the wind. Depending on size of dish and size of mount and average wind speed in the area. I would probably start at 4 x 25-50lbs magnets on a satellite dish style mount and move up as needed. Something like http://www.amazon.com/Master-Magnetics-RB50B3NX5-Magnetic-Fastener/dp/B00IYFOIYW/ for the magnets
FYI, these are the magnets I bought. These look like 35 lbs, I was using 8 before with no problems holding a full growler, with 9 in this configuration, it's actually kind of difficult to pull them off.