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Description and Eagle schematics for low power 200 watt version. Also diplexer for 2m, shortwave and 70cm band. Detailed photograph.
CuAg wire is used for the coils, normal Cu wire should work too. The capacitors are 500 Volt types. This diplexer for 2m and shortwave band can be used along with an IC706 in the car.
http://df2ck.de/tech/triplexer/triplexer.html