A device for mounting an antenna to a rail is provided. The device includes a first clamp member and a second clamp member. The first clamp member includes a planar base plate having a first surface and a second surface. The planar base plate has at least two slots spaced apart on a longitudinal axis. At least two extension sections extend from the first surface of the planar base plate and being spaced apart along the longitudinal axis and closer to a center than the at least two slots. Each extension section includes a patterned cutout area configured to receive the rail. A plurality of threaded fasteners extend from the first surface of the planar base plate and being positioned outside the patterned cutout area along a transverse axis perpendicular to the longitudinal axis. The second clamp member has a plurality of through-holes configured to receive the plurality of threaded fasteners and a planar surface facing toward the first surface of the first clamp member.