TEN N scale rounded extruded hexagonal dome for ATCS antennas, commonly seen at railroad control points equipped with PTC.
Bulk pack with both types also available here: http://shpws.me/KaMI
Simply soak in Bestine overnight to remove all waxy residue, allow dry and paint as desired. Holes are included on the back if the more prototypical method of mounting is desired, use copper wire 0.010" or smaller to strap the dome onto a 0.020' rod for the short mast.