If I recall correctly, nope.

A vertically polarized slot antenna will have an azimuth pattern like a
dipole.

If you want a vertically polarized omnidirectional antenna, you build a
collinear array of vertical elements. If you want a horizontally
polarized omnidirectional antenna, you build a collinear array of
everything EXCEPT those elements, and feed that. A slot radiates the
same way that an antenna element of the same size and shape would
radiate, but the E and H fields are interchanged, and therefore has the
opposite polarization.

Look up Babinet.

73,
Dan
N3OX
www.n3ox.net