I added an external antenna to my pi by removing the 0 ohm resistor and connecting it to the antenna pad along with an antenna. It seems to be working just fine. I was wondering if there is a way I could definitively know the pi is using the external antenna and not the internal one. Thanks in advance.
You could try: https://github.com/uoaerg/wavemon
and compare the signal strength. Of cause you need another pi for that
I cut the trace to the internal antenna when I modded mine.
Good idea. Thanks.