| 摘要 |
PROBLEM TO BE SOLVED: To effectively melt the snow fallen on an antenna device. SOLUTION: A snow protection sheet 11 has a blowing port 11a-1 to transmit the radio waves and covers an antenna 20. A warm air generator 13 sends the warm air into the sheet 11 via the port 11a-1 and melts the snow fallen on the sheet 11. A heater 12 placed on the antenna 20 melts the snow fallen on a radio wave transmitter-receiver 30 which transmits and receives the radio waves.
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