Small cell antennas suitable for mimo operation

A base station antenna, comprising:

• a first set of radiating elements that are arranged as a first linear array of radiating elements;
• a second set of radiating elements that are arranged as a second linear array of radiating elements, the second linear array mounted opposite the first linear array and pointing in a different direction than the first linear array;
• and
• a feed network that couples the first and second sets of radiating elements to a port of a radio, wherein the feed network is configured to feed the first set of radiating elements out-of-phase with respect to the second set of radiating elements.

A base station antenna, comprising:

• a first group of radiating elements that are mounted in front of a first backplane;
• a second group of radiating elements that are mounted in front of a second backplane,
• a third group of radiating elements that are mounted in front of a third backplane;
• and
• a fourth group of radiating elements that are mounted in front of a fourth backplane;
• wherein the first and second backplanes face in different directions,
• wherein the third and fourth backplanes face different directions,
• wherein the first and second groups of radiating elements are coupled to a first port of a radio via a first feed network,
• wherein the third and fourth groups of radiating elements are coupled to a second port of the radio via a second feed network, and
• wherein the first group of radiating elements is positioned generally opposite the second group of radiating elements.