SeeJ Beam pattern below. It can be built for around $15.00 (1998 prices) and you can use your old Jpole as a basis for the JBeam. You'll probably need to shorten the main 1/2 wave element by 1 to 2 inches, as the reflector and director tend to couple and lower the resonance of your original jpole toward the lower part of the band.
BUILDTHE J BEAM FOR 2 METERS AND UP! Condensed from an article by Ed Bathgate, N3SDO as published in CQ VHF Magazine July, 1988 and used with his permission. The element lengths and spacings are a combination of info from the ARRL Antenna Book section on 2 meter Yagi antennas, and from experiments with a field strength meter and different

Homebrew2 meter Yagi construction. • 2 1/4 inch x 48 inch Steel rods (I know they'll rust, it's just temporary to get it to work, I'll get aluminum later) I don't have any coaxial cable (don't know the best type to get) and don't know how to match the impedance of the cable to the antenna.

\n \nhow to build a 2 meter yagi antenna
Performanceis what counts! After you build one (try building a small one for 6 or 2 meters) and you'll agree that based on gain and F:B, the Moxon Rectangle is a superb antenna that is fun to build, works like a champ and is virtually indestructible. And they're great for portable field operating as well.
AFive-Element Quad Antenna for 2 Meters By Jim Reynante, KD6GLFPO Box 27856San Diego, CA 92198 When building antennas using wood, be sure to select pieces that are well-seasoned and free of knots or damage. Start with an 8-foot section of 2×2. Cut a 2-foot section from one end. (Don't discard it.
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how to build a 2 meter yagi antenna