Which one did you installed? How is it? Seems like the Sector 5 is about 1mm higher from the surface of the screen. The glass about 2-3mm thick?
hmm after go google.. I think for iphone5, don't think any metal bumper will cause any signal lost issue now unless the back panel is cover by metal. To be correct the top and bottom back panel is cover by metal.
"the iPhone 5’s back panel features a cell antenna on the top and bottom of the device, surrounded by a thin strip of glass that allows Wi-Fi, GPS, Bluetooth and other signals to “peek” through. These antennas are so far apart that unless you have freaklish long hands, it’s impossible to “bridge” them with your grip. So long Antennagate."
Read more at Why Apple Is Killing Off The Bumper, And Why You Won’t Need A Case For Your iPhone 5 | Cult of Mac

