Perfect length wire for End Fed Half Wave antennas 

Just divide 468 by 3.5 divided by 2 for a half wave dipole

OOPS ! 15 meters is 3 wave lengths and 10 meters is 4 wave lengths. Let's call it a typo ! Hi Hi Barry

This is where I get confused . Divide speed of light by freq. Using same units 300 divided by 14Mhz gives ? Metres. Full Wave. Ok but then radio waves travel through air faster than through a conductor, wire for example. RF cable manufacturers quote correction factors whereby 0.95 for example so cable length full Wave multiplied by 0.95 gives wavelength in a conductor. That where I get confused . Food for thought. Cheers from old George

Need help, trying an EF Non Resonant for 10-80 meters. The 9:1 is right next to the house so coax is approx. 15'. I tried with and without a common mode choke at antenna feed point and transceiver. I have tried various lengths of main wire (102' to 125')and counterpoises (15' to 65'). Using a VNA the SWR curves look for 20 meters only. I noticed you did not discuss coax length. My understanding is that this is important if not using a common mode choke. Are you using a CMC? Any suggestions for my issues?

Where does the choke, seen on some end fed antennas come into play when making you wire measurements.

Dude...😂😂😂