The magnet is either good or weak and a strong wind knocked it over so I had to use wire to keep it from moving. But it increased the range of my Mighty Mule opener. It's hard to say how much. My range varied from 6 feet to 20 or 50 feet depending on the number of sunspots on those days. But overall I am satisfied with this antenna. My Mighty Mule works thanks to this antenna and not in a dumpster.
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