This is original Nagoya antenna NA-771 Dual Band BNC.
It will boost the signal significantly. It can be used with TX V6 Long Range System or any other compatible device.

Specifications:
Frequency:144/430MHz
Gain:2.15db / 3.0db
Max power:10Watts
V.S.W.R:Less 1.5
Impedance:50 OHM.
Connector:BNC-Male
Length:396 mm
Weight:53g