An antenna assembly includes a radome, a camera, and a plug assembly. The radome defines an opening. The camera is positionable at least partially within the opening. The camera and the radome define a passage when the camera is positioned at least partially within the opening of the radome. The plug assembly is positionable at least partially within the passage. The plug assembly includes a plug having one or more first coupling structures and a seal having one or more second coupling structures. At least one of the first coupling structures and at least one of the second coupling structures are mateable to detachably couple the seal to the plug to substantially prevent contaminants from passing into the radome via the opening of the radome. Other antenna assemblies, plug assemblies, and methods relating to assembling antenna assemblies and/or plug assemblies are also disclosed.