Ask what antenna a RUT router should run and this is the default answer: the PR1US440, Teltonika's own mobile LTE whip with an SMA connector, specified across the RUT230, RUT240, RUT900, RUT950, RUT955, RUTX08, RUTX09, and beyond. It threads directly onto the router's cellular port, swivels to vertical in any mounting orientation, and restores the exact RF configuration the routers were certified with. Fleets buy them by the handful - as build-out stock, as spares for snapped and borrowed whips, and as the honest baseline against which any fancier antenna gets judged. The cellular antenna is tuned for 4G LTE cellular service and terminates in a SMA male connector. Two of these on a MIMO router's ports is the certified starting point - deviate only when a site survey says to. Thread onto the mobile SMA port, swivel vertical, done. For MIMO models fit both ports; for weak sites, test first, then step up to cabled or roof antennas with data in hand. Cloud Care Networks stocks the Teltonika PR1US440 alongside the gateways and routers it supports, so IT and field-service teams can consolidate antennas, spares, and replacement hardware on a single order.