You can definitely do that, and there are a lot of tutorials to do so... Have not done it myself, but for example for the mr3020 i've seen such a hack

On June 1, 2018 9:07:59 PM CDT, Patricio Gibbs <patricio@altermundi.net> wrote:
Has anyone modified a router that had non-removable antennas to add an 
attachment for a removable antenna?

I imagine it would require:
- acquire male RP-SMA connector.
- open the router, cut a hole somewhere in the casing, and mount the
male RP-SMA connector there.
- disconnect the wire of a stock antenna and put a wire from that part
of the board to the RP-SMA male.
- close the router.

Doing this, the router keeps its stock antenna(s), but one of them is
disconnected.

I guess there's a question about how much power the radio puts out, to
know what sort of antenna will work... I don't yet know much about those
calculations.

~ P


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