The 270CP22 is a circularly polarized antenna optimized for Low Earth Orbit (LEO) satellite communications or other applications where a broad circular polarized antenna is required. Optimum match is between 267 & 273 MHz. A preamp can be mounted close to the antenna for almost no coax loss before the preamp, maximizing your receive performance. Computer design techniques help keep spurious side lobes low down for optimum signal to noise ratios. This antenna features the same CNC machined, O-ring and silicone-gel sealed, driven element assemblies common to all M2 Yagi antennas. This insures years of trouble free performance regardless of weather.