Gizmotchy G21

The Gizmotchy G21 is a 2-element, dual-polarity directional beam antenna designed for the 10 and 11-meter radio bands (CB and Amateur radio). It is highly regarded for its “buildable” design, allowing users to expand its performance by adding modular “Power Boosters” over time.
Key Specifications
Elements: 2 (effectively 6 elements total across dual polarities).
Gain: 9 dB.
Power Handling: 1,500 Watts (comes with 1,500W Gamma matches).
Polarization: Dual (Vertical and Horizontal).
Boom Length: 160 cm (~5.25 feet).
Performance: Offers a power multiplication factor of 21 and a front-to-back separation of 23 dB.
Distinguishing Features
Expandability: The G21 serves as a base unit. You can upgrade it to a 3-element (G31), 4-element (G41), or larger antenna by simply adding more boom sections and elements.
Comparison to G25: The G21 and G25 are identical in physical structure; the primary difference is the power rating of the included Gamma match.
Durability: It is built with seamless aluminum construction and is designed to withstand wind speeds up to 90 mph (135 km/h).