KCCU - Lawton 89.3 FM (HD1 & 2) is operating at reduced power due to ice on the antenna. When ice forms on FM antenna structures, it causes the radiation to be focused back inwards (VSWR.) In extreme cases, this phenomenon can damage the antenna itself. When the computer detects VSWR above a certain ratio, power to the transmitter is shut off to prevent damage to the antenna. KCCU is currently using a low-wattage back-up transmitter.