Here i will post some graphics to help you choose right connectors
![](http://prodrone.pl/wp-content/uploads/2019/05/which_connector.jpg)
There is also problem with u.fl and w.fl connectors. Here you will find diagram how to find differences between them. Generally w.fl (IPEX4) connector is smaller.
![](http://prodrone.pl/wp-content/uploads/2019/05/uflwfl-1024x712.jpg)
And here’s comparison of most popular connectors used in RC applications.
Counting from above:
-SMA connector,
-U.FL,
-IPEX4,
-MMCX straight,
-MMCX angle)
![](http://prodrone.pl/wp-content/uploads/2019/05/connectors-1.jpg)