Embodiments provide tower-mountable base station antenna enclosure systems to reduce effective wind loads of housed antenna components. The enclosure systems can include wind deflection radomes sized to house antenna components and mountable to tower structures by rotatable couplings. For example, embodiments can have a rotational axis that is substantially transverse to primary wind directions, and the wind deflection structures can be mounted in a manner that permits substantially free rotation around the axis. Such enclosure systems can reduce the wind load of the antenna as deployed on a tower, such that a smaller marginal structural impact can be attributed to deployed antenna components, and the antenna components can be considered as smaller structural loads on the tower.