I have one and it does not rattle. Gain can be measured in a couple of different ways. It’s probably the best tri-band antenna available for the SDS100. But any handheld multi-band antenna is a compromise. If you find one band you most frequent, get an antenna for that band. And hopefully the other bands you less importance on have signal strengths that don’t require a multi-band antenna. I run the Remtronix 800MHz single band antenna on my SDS100 and still hear the VHF & UHF agencies in my area just fine, even though the antenna isn’t designed of those bands. And that’s because I am close. A lot of people want to hear a particular agency outside of their coverage area, let’s say you want to hear the police department for the town next to your town. And while it’s possible, even very probable, when you aren’t within their coverage area, an area they aren’t concerned with, I’m thankful if I hear them but don’t get too upset if I don’t. If theres really a need to hear agencies on the Fringe, an outside antenna up as high as reasonably possible should be used. That opens up other concerns such as type of coax, lightning protection, etc.
