Sealed Transmitter Assembly For Subsurface Utility Installations

An assembly (10) for installation in a subsurface ground enclosure has an electronic transmitter, an antenna and other circuitry that are encapsulated against moisture conditions. The assembly (10) comprises a circuit board (31) supporting radio frequency transmitter circuitry, the circuit board (31) having at least two orthogonal edges (31b, 31c), an antenna (14, 15) having two 90-degree bent portions extending from orthogonal edges (31b, 31c) of the circuit board (31), a housing bottom portion (11) with an internal barrier (18) separating an L-shaped antenna compartment (13) adjacent two sides of the circuit board (31) from a battery compartment (16) underneath the circuit board (31), sealing material for encapsulating the circuit board (31) and the batteries (17) in the battery compartment (16), and a cover (20) that protects the antenna compartment (13) from entry of the sealing material.