Johnex
4
The Atheros 9331 chip won’t care what antenna you put on it, but you can guarantee that you will get better range using an external antenna vs the internal one. Using a very high gain antenna might be illegal in some countries, as it will simulate a much higher power range than stock.
You could techincally use something like this if you wanted:
Remember that the higher gain antenna you get, the smaller the signal cone becomes. You are turning it more and more into a directional antenna, that will need to be honed in properly.
You can also make your own and test:
Those guys were able to get very long range, 10km or more from one part of the city to the outskirts.
On the Mifi, you will also have to cut a track on the board, so you won’t be able to go back to the internal antenna afterwards if you do decide to go external.