If you're asking for something to use with RF dongles with the MCX connector ..... (I also have similar cables for PAL connectors)
I use a pigtail cable similar to those shown below. I have an assortment of lengths.
They're a few dollars each on ebay and take about 2 weeks to come from Asia.
They take the strain off of the USB dongles, and the right angle MCX connector swivels as you move the cable or dongle.
Just decide what kind of connector you want on the other end.
If you go with SMA connectors, do NOT get reverse polarity types (RP) they won't work.
Rich