This antenna is a solid, no ground antenna that can be mounted in a variety of locations. The XMM102/XMM4 marine antenna is water proof and corrosion resistant. This antenna is XM APPROVED: Per specification XM-TEC-3-0009-2-RD Electrical ? Frequency: 2332.5 to 2345.0 MHz ? Gain: 2dBic (20-60 deg elevation) -2 dBi (horizon) ? Bandwidth: 12.5 MHz ? Impedance: 50 ohms ? Polarization: LHCP (20-60 deg elevation) Linear (Horizon) LNA ? Gain: 30 dB, typical ? Noise Filter: 1.0 dB, maximum ? Power: 4.5 Vdc, nominal ? Current Drain: 50 mA, maximum ? Unwanted Signal Rejection: 35 dB, minimum Cable ? Type: Coaxial RG-58A/U ? Length: 30 feet ? Connector: SMB Mechanical Specifications ? Overall Height: 10.20 inches ? Effective Diameter: 0.75-0.82 inches ? Housing Material: White ABS, UV Stable Mounting ? Fits Standard Marine Antenna Base Other Specifications ? Wind Rating: 100 mhp ? Weight: 0.25 Lbs w/out Cable ? Temperature: -40 degrees C to + 105 degrees C. operating -45 degrees C to + 120 degress C, storage