Cross-dipole radiating elements having helix-shaped dipole arms and base station antennas having such radiating elements

A base station antenna, comprising:

• a first radio frequency (“RF”) port;
• a first array of radiating elements that are configured to transmit and receive RF signals in a first operating frequency band, where each of the radiating elements in the first array is coupled to the first RF port;
• a second RF port;
• and
• a second array of radiating elements that are configured to transmit and receive RF signals in a second operating frequency band, where each of the radiating elements in the second array is coupled to the second RF port, and the second operating frequency band is at higher frequencies than the first operating frequency band,
• wherein a first of the radiating elements in the first array includes a first dipole radiator that has a center-fed first dipole arm that comprises a first conductor, where at least a first portion of the first conductor has a helix-shape.