AVS Electronics BM60HP Mode D'emploi page 41

In order to extend the height of the protection, two couples of beams
can be installed as shown in the picture. In this case, it is
suggested to use couples of beams having
close working frequency (two couples
with frequency F1 and F2 or F3 and
F4)
If the fence is made of bushes or metal fences
subject to possible movement, the minimum
distance must be 1 meter for BM60HP
and 10 meters for BM120HP and
BM200HP.
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