Base station antennas having an active antenna module and related devices and methods

A base station antenna comprising:

• a housing of a base station antenna comprising a passive antenna assembly in the housing;
• left and right side external mounting members that project rearward from a rear of the housing and extend along only a sub-length of the housing between a top portion and a longitudinally spaced apart medial portion of the housing, wherein the left and right side external mounting members are laterally spaced apart and extend in a longitudinal direction of the base station antenna;
• and
• a frequency selective surface and/or substrate “FSS” in the housing, wherein the FSS extends laterally a distance that is at least partially between the left and right side mounting members and extends longitudinally a distance sufficient to reside at least partially between the top portion of the housing and a lower end of the left and right side mounting members.

A base station antenna comprising:

• a housing of a base station antenna comprising a passive antenna assembly in the housing;
• left and right side external mounting members that project rearward from a rear of the housing and extend along only a sub-length of the housing between a top portion and a longitudinally spaced apart medial portion of the housing, wherein the left and right side external mounting members are laterally spaced apart and extend in a longitudinal direction of the base station antenna;
• and
• a frequency selective surface and/or substrate in the housing that is positioned to define a front to back separation distance from a reflector in an active antenna module mounted to the left and right side external mounting members that is in a range of about 3 mm to about 10 mm.