https://wifiexpert.us/customRFCable.php is your friend
He ships very fast and makes excellent custom cables.
He even repaired a few banged up cables for free. Top notch service!
For the R700 you'll need one end to be a RP-TNC male and whatever connector goes into your antennas/mats.
Prob a great idea to keep a spare cable or two on hand in case you're ever in a pinch.
I'm in the KC area but I'm not gonna go to the Nike meet this weekend.