The AirNav ADS-B 1090 MHz Outdoor Antenna as I have installed outside.
(no way to install on the roof, as I live on the 3rd floor of a six-story apartment building)
High performance, Omnidirectional Antenna optimized for long & short-range ADS-B ADS-B 1090 MHz reception. Shipped with a 10 meters (about 30 ft) cable and SMA connector. Compatible with any AirNav RadarBox ADS-B receiver and with other similar SMA connector receivers. Built with fiberglass & aluminium alloy for both indoor/outdoor use. Guaranteed 50-100 nm range improvement. Reduced signal loss.