But for those with receivers lacking a BNC -base antenna or needing to upgrade/replace your antenna, consider the Superstick II!
This great antenna is a 10-section, 54-inches/138 cm in length fully extended, with a loading coil on its base for use with ham radio 2-meter hand-held radios or scanners, and it works great with the WR-3 as well, because the matching-coil is in series with the antenna (and not shunted to ground)! This 2-meter ham-band 5/8-wave telescoping-whip is made by Smiley Antenna Co., Inc. (408 La Cresta Heights Rd, El Cajon, CA 92021, USA).
GroveEnterprises, Inc. in North Carolina, USA: : Grove sells (for US$14.95 plus shipping cost) a 6 to approx. 30-inch telescoping whip that would seem to work good with the WR-3 except for it being shorter than the Firestick II. I've not tested out this antenna that also swivels, but it would work for its intended application for handheld scanners and two-way radio units that use a BNC jack, and so if you have such radios, it would work great and also double as your WR-3 antenna.