Full instructions accompany each antenna.
The Cubex Matching Transformer - Provides Single 50 ohm coax feed for 3 band and 5 band Quads. Note, this is a compromise feed device which may reduce bandwidth and side lobe spurious. 10dbi on 10 and 15 meters - 9 dbi on 20 meters. All elements precisely measured, cut and marked for easy assembly. Positive clamping to boom.