wrote ...
Szczepan Białek wrote:

Some antennas (emitting and receiving) must be parallel. Some not.
Which ones? ( my knowledge about antennas is zero).

Obviously since your statement is babbling nonsense.

So I do the next approach:
Some antennas (emitting and receiving) work better if they are parallel.
Sometimes "the polarization is not that important. Your
cell phone and indoor WIFI are examples." (Wim).
What emitting antennas are used in the applications where "the polarization
is not that important"?
S*