The Laird UTRA4502S3NB-001 Ultra Phantom is an omnidirectional, low profile mobile antenna that operates in the 450 – 512 MHz band. This antenna is vertically polarized and is NMO mounted. With a compact size of 3.4 in (H) x 1.4 in (L) x 1.4 in (W), the shorted monopole antenna has a maximum gain of 4.1 dBi and 50 Ohm impedance. White.