Yes!

Feeding at the "bottom" makes it horizontal and the "side" vertical.
There is obviously some response in the other polarity (more than a
yagi?) but I havent researched this. The square can also be a
rectangle... (Beware of feedpoint Z changes)

You can also feed the in quadrature on two adjacent corners for circular..

Cheers Bob VK2YQA

Howard W3CQH wrote:
Question - Is the polarity of the antenna based on the feed point?

73's