Installing EM-406 Vertically

Can the EM-406A be installed vertically or will that affect satellite reception?

What about mounting in a jiffy box that is then attached to the middle of an aluminium road sign about 3’ x 3’ in size so the EM-406 is vertical and only about 1/2" from the aluminium sign?

I currently have several units installed horizontally in that position so the edge is about 1/2" from the sign and they work perfectly. I now want to redesign the circuit board and install the EM406 vertically.

The EM-406A uses a [patch antenna. Take a look at the antenna’s gain - it mostly just looks at the 180 degrees above it, so if you turn it on it’s side, you’re only going to see half the sky.](Patch antenna - Wikipedia)