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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
The Bangle.js is a ceramic antenna - so unfortunately it doesn't leave much room for tuning :(
The metal back could be an issue, but there's also the battery in the way in that direction. One thing that could help is the 'NSEW' ring actually contains a bit of metal. I guess you could ping that off (although obviously it affects the watch itself).
Not that this is much help, but the Bangle.js 2 will launch soon (developer devices are already available at https://shop.espruino.com/banglejs2-dev) and that has an nRF52840 with a plastic case and massively better signal strength