Furuno WR2120, Руководство по установке

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Add extra lightning rod:
This is an example of adding a lightning rod to compensate for existing lightning rod limitations:
It is installed next to a chimney, 8 meters away from the radar. In this case the chimney is fixed,
therefore it is better to install a new lightning rod as shown in Figure A.4.
The weather radar will be properly covered by the combination of new and existing lightning rods.
The height requirement for the new lightning rod for each LPL is shown in Table A.9. The length
will be selected depending on the height limitation, therefore it is better to use a longer one.
Unfortunately in this case it is not enough for protecting the weather radar from lightning.
In order to provide a solution for this situation we suggest adding a new lightning rod installed
nearby.
Basically a newly prepared rod should be designed as long as possible, but it needs to be within
the height limitation.
Figure A.4: Drawing at rooftop and candidate place to install the new lightning rod
Rooftop of building
2.7m tall
Radar w/ base
New Lightning Rod
Minimum 4m
4m Lightning Rod
8m
12m