Abstract: An antenna farm enclosure for a locomotive cab includes a planar lid hinged to a base and bearing an array of compact antennae. A separate frame holds the antenna farm above the roof to permit wind and moisture to pass beneath, and allows for adjustments for irregularities in the cab roof. A chimney surrounding a port through the cab roof extends upward into the antenna farm enclosure, forming a dam that prevents accumulated moisture from entering the cab or the enclosure. Cables from the antennae extend through the chimney into the cab. A wide flange surrounds the lid and bears against two concentric gaskets to seal the enclosure. Specialized hold-down devices arrayed around the flange compress both gaskets, and comprise threaded shafts hingedly coupled to the base. The slightly arched flange asserts spring-like tension against the hold-down devices, which compress the arched flange to strengthen the seal.