Crossed dipoles form a turnstile antenna. In theory, it's a pretty good Omni with peaks at 0, 90, 180, and 270 degrees. There are slight nulls between those directions.
https://www.google.com/search?q=turn...iw=911&bih=363
But holl_ands modeled it, showing that it is a little less Omni that theory indicates.
https://imageevent.com/holl_ands/omni/fmturnstileacfmss
I don't do modeling, but that doesn't look like a 90 degree phase shift line between the crossed dipoles, so I don't have confidence in his model. How long is the feed line between your dipoles?