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One of the simplest, cost effective, and efficient HF antennas you can build is the half-wavelength dipole. All you need is the correct length of wire for your band of choice, a convenient length of 50 ohm coaxial cable, two supports, and your HF rig.
In this video from Johnny (W5KV), we get some valuable suggestions for making a dipole antenna that will serve the operating requirements of both newly-licensed hams as well as experienced "old timers."
Johnny introduces his basic dipole project with these suggestions: