Antenna query
If you know what polarization of transmitting antenna is having,then it is easy to guess for receiving antenna.
But if you dnt know of that transmitting antenna polarization, or in case your antenna is transmitting one, then
there might be chance that you will have more than one polarization is involved.
Some standard applications like boardcast or mobile have some typical type of polarization,so you can check these many things before deciding type of polariztion.