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I almost forgot about the "bird ball" on the top of some Sirio base antennas. I've put this one up and a Sirio 2016. Within a year (depending on your bird population) both had  birds land on that ball and jump off in a hurry. As soon as a decent size one jumps off to fly, it will bend the top element. I cut the ball off now and just extend the whip a few inches to compensate for resonance.