Seco-Larm SK-91ERSD Extended Range Antenna (Dipole Type) For Up To 1,000-ft. Range. 
Features: - Use SK-91ERSD to extend range up to 1000 feet for these SECO-LARM RF receivers:
  - SK-910R single-channel receiver,
  - SK-910R2 two-channel receiver,
  - SK-910R4 four-channel receiver
  - Extend range up to 1000 feet (open air) with existing remote
  - Easily plugs into a connector on the receiver - no extra wiring needed
  - Includes 9-foot cable
  - Power supply: +5VDC, +/- 0.1VDC (supplied by receiver)
  - Current consumption: 4.0mA
  - Sensitivity: 0.89mV @ -108dBm
  - Frequency: 315MHz
  - Bandwidth: 3.0MHz (-3dB)
  - Double-stick mounting tape included