As Sam said check out Ventevinfra but if you need to order direct from Cisco for what ever reason:
Cisco has their own low-loss RF cables you can order from them as well
AIR-CAB005LL-R - 5-ft low-loss cable, one RP-TNC plug, one RP‑TNC jack
AIR-CAB020LL-R - 20-ft low-loss cable, one RP-TNC plug, one RP‑TNC jack
and a couple of bigger lengths.
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