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I have one and yes the firmware is upgradable but honestly the radio is crap. The AM Aircraft receive is very prone to being swamped, the build quality is suspect and yes I have several Chinese HTs to compare it to. Its only redeeming value is the ability to hack the firmware.
While not on 11 meters but I have run stacked Cushcraft 17B2 17 element beams at 80'. It was a pain in the ass to setup but it worked great. For those that don't know this was on 2 meter 144.200mhz.
I have never had one or a 757 but have heard plenty of them and they just don't sound good. I really hate the turner sound to begin with so that could come into play.
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