Hi I have a Th3 Jr 14 21 28mhz tri bander that does need some tlc, will need a new plastic kit.
Hy-Gain HF Beam Antennas
Hy-Gain TH-3JRS Tri-Band Beam Antennas were designed for the ham that has space limitations but still wants top performance on 20, 15, and 10 meters. TH-3JRS Tri-Band Antennas are constructed from taper-swaged aluminum tubing for low wind resistance and low weight; ideal for rooftop or lightweight tower installations. Hy-Gain TH-3JRS beams can be rotated with a heavy-duty TV rotator or a Hy-Gain CD-45II. These antennas feature super-strength stainless steel hardware and a boom-to-mast bracket that will fit masts up to 2 in, outside Diameter.The Hy-Gain TH-3JR (Thunderbird Junior) is a popular three-element tri-band Yagi antenna designed for amateur radio operators with space or weight limitations. As of 2026, it remains a common choice for rooftop or lightweight tower installations.
Key Specifications
Frequency Bands: 10, 15, and 20 meters.
Elements: 3 (Reflector, Driven Element, and Director).
Forward Gain: Up to 8 dBi.
Power Rating: 600 Watts PEP / 300 Watts AM.
Boom Length: 12 feet (3.65 m).
Weight: Approximately 21 lbs (11.7 kg).
Turning Radius: 14.8 to 14.9 feet.
Design and Installation Features
Compact Construction: Uses taper-swaged aluminum tubing to minimize wind resistance and weight.
Rotator Compatibility: Due to its light weight, it can be rotated using a heavy-duty TV rotator or standard models like the Hy-Gain CD-45II.
Mounting: The boom-to-mast bracket typically fits masts from 1.25 to 2.0 inches in diameter.
Maintenance: A common refurbishing step for older units is replacing the high-impact plastic insulators and caps; Hy-Gain offers a specific kit (PK-TH3JR-PLS) for this purpose.
Recommended Components & Resources
Balun: While not always included, using a 1:1 balun (such as the Hy-Gain BN-86) is recommended to act as an RF choke and ensure a symmetrical radiation pattern.
Documentation: Detailed assembly and operation guides can be found in the TH-3JRS Instruction Manual or archived at QSL.net.
Retailers: In 2026, the antenna and its parts are available through major amateur radio suppliers such as DX Engineering and MFJ Enterprises.
You will have to collect in Durban AS IT IS TOO LONG TO COURIER IT TNX DE ZS5GMW
