Sirio...never had either one personally however, but know people who have had both, and have read lots of posts on different forums on the subject, and have never once seen a bad report on the Sirio antenna's....Plenty of negative posts on the Strykers and Wilsons, but you will never see a negative post on Sirios mobile antennas.
Lot's of guys have had good luck with the Stryker SR A10 antenna tho, and swear by them. but there's also allot of guys who swear "at" them too.
the 447 should be a good radio, I had one of the original Strykers when they first came out, the Stryker 440, and got all kinds of compliments on that radio...probably should have kept that one...oh well.
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