RF magnet antenna 2dBi R-SMA plug-in connector straight 2 m RF R-SMA antenna extension 3 m Field strength testing tool swView 915 MHz Power supply 24V DC for Wireless repeater RF Rx RF 10 H SW917 RF 13 W SW917 RF 13 R SW917 RF 13 WH SW917 RF 13 D SW917 RF 13 DS SW917 RF 95 W LR SW917 RF 95 WK LR SW917 RF 95 R LR SW917 RF 95 RL LR SW917 RF 95 WH LR SW917 RF 95 WHM LR SW917