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This is post 2450 in a continuing series of simple ham radio antennas.
End-Fed Halfwavelength Antennas (EFHW) are effective, simple antennas for both home and portable use. Unlike dipole antennas which can be easily matched to 50 or 72 ohm coaxial cable, EFHWs exhibit a high impedance, necessitating a transformer to protect your transceiver.
In this well-made video from KA5WPM, we learn how to make a 49:1 transformer suitable for use with EFHW or random length long wire antennas.
Here are some general comments from KA5WPM: