Like using and amplifier and external antenna for an android phone maybe? Assuming you cant do more on the puck then use the max transmit power
Would an external wifi antenna automatically be used for bluetooth as well, seeing that it is all 2.4Ghz?
If you've already increased the transmit power with NRF.setTxPower then yes, I guess you're going to have to look at ways to make the receiver better.
As a very low-tech solution you could make the receiver more directional by placing it in the middle of a parabolic reflector - you could google 'Cantenna' for some super cheap options.
Just using an external USB Bluetooth dongle might help, especially if you found a good one, or one that you could attach an external aerial to. No promises, but at least something like https://www.newfrog.com/p/150mbps-wifi-bluetooth-4-0-wireless-usb-adapter-network-card-with-antenna-125900.html seems to have a better aerial on it.
Otherwise if you're just on a phone you might be a bit stuck I'm afraid.
would this be credible?
It looks possible it'd be ok, yes... But I wouldn't want to say it'll definitely work!
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