We have made a nice collection of RF connectors for you to choose from. In this group you will find, SMA Male to SMA Female extensions of varying lengths. You will also see another group of extensions with 90° connections with either male or female ends. The coax cable is RG316 (RG178 on the shorter cables) and the connectors and build quality are very good.
To help and avoid confusion, here is a chart that shows the different configurations of the SMA and RP SMA connectors.