An antenna system includes: a first sub-system comprising at least one first antenna element shaped and disposed to have a first electrical polarization, in a first direction, in response to excitation of the first sub-system; and a second sub-system comprising at least one second antenna element shaped and disposed to have a second electrical polarization, in a second direction, in response to excitation of the second sub-system; where the at least one first antenna element and the at least one second antenna element are complementary antenna elements; and where the first sub-system and the second sub-system are co-located such that first sub-system and the second sub-system in combination provide a slant-polarization for the antenna system.