| 摘要 |
PROBLEM TO BE SOLVED: To safely and easily install an antenna on the roof, and to hold the stable attitude of the antenna in a long term. SOLUTION: Fastening metal fittings 10 and 20 are mounted on the upper and lower two parts of a mast 3 on which an antenna 1 is mounted, and branch line tension tools 50 are mounted on the fastening metal fitting 20 at the lower position, and branch line folding tools 30 are fixed to eaves 2a of a roof 2. Then, one edge of the branch line 40 is fixed to the fastening metallic fitting 10 at the upper level side mounted on the mast 3, and the branch line 40 is folded by the branch line folding tool 30, and the other edge of the branch line 40 is connected to the branch line tension tool 50, and a tension is applied to the branch line 40 by the branch line tension tool 50.
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