Pulse LARSEN Antennas RO3ISMNM Outdoor Omni Directional Antenna functions within the frequency spanning from 430MHz to 440MHz and from 860MHz to 930MHz. The RO3ISMNM antenna is well-suited for outdoor communication needs that demand omni directional radiation patterns. The RO3ISMNM antenna is designed to endure full exposure to wind, rain, snow, high temperatures, and sun exposure when mounted. Additionally, the antenna is DC grounded to provide lightning protection.