The trick to making this work is to connect both the inner core of the wire and the shielding (outer conductive layer) to the respective spots on the board. Usually the shield is grounded and the inner core is the connection to the antennae. If you buy the amazon linked antennae above it is easiest if you remove the small snap-on type connector. If you pry up the two edges it pulls right off leaving you with a tiny wire in the middle and the shielding exposed. They are separated by an inner jacket. It was the perfect length for me to use the existing solder to attach it. Here are some pictures to hopefully help. Thank you to all who previously posted, saved me a bunch of money.
#1: snap-on type connector with two edges pried up.
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#2: soldered to the board. Be mindful that you need two separate connection points. If solder bridges between the two or you only connect the inner core your range will be severly impacted like the above person said.
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#3: zoomed out showing connection and wire placement.
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#4: The SMA connector is too long to use the existing hole (couldn't close the case), so I used Sugru to hold it a little further outside of the case.
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#5: with the antennae connected. It does stick out the back a bit and can't lay flat, but I use it with the kickstand most of the time so no big deal.
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