1A5639-7 Garage Door Opener Extra Universal Remote 433mhz Antenna Kit
(8)Antenna length (mm): 400. Increasing range of transmitters with 433,92MHz up to 250m! Impedence: 50 Ohm Bracket made from stainless steel. 10)Cable model: RG174. 9)Cable length (m): 2. 3)Standing wave ratio ≤1.5.