Understanding transmission lines is a vital part of the art of radio--the proper selection and use of a feedline is more important than the choice of radio. This is particularly true of multiband antennas fed with tuners--you can lose several S-units of transmit signal strength by making poor choices.

• Another Look at Reflections
  The classic article series on transmission lines by M. Walter Maxwell, W2DU.  Well worth reading if you wish to understand SWR and its effect on system efficiency
• Understanding SWR by Example 
  QST November 2006.  The formatting issue on the last sentence of page 3 is result of a typo correction--the font used isn't supported in 2016.  "Next try the 100 ohm antenna with the same coax."
• Standing Wave Ratio--What does it Really Mean?  QST March 2015
• Measuring Cable Loss
  QEX May/June 2005
• Better Feedline Loss Measurements with Antenna Analyzers
  QST March 2004 Hints and Kinks
• Measuring Cable Loss
  QEX, May 2005, pp 44-46
  An improved-accuracy method of measuring coaxial cable loss with antenna analyzers.
• Don't Solder to Connector Adapters!
  QST December 1995, p.76 (Hints and Hinks)
  A warning about the installation of PL-259s to smaller coax cable.
• "My Feed Line Tunes My Antenna!"
  QST November 1991, pp. 33-35
  A discussion on how the feed line can change the resonant frequency of the antenna.
• The Whys of Transmission Lines Part 1
  QST January 1965, pp. 25-28
  A beginner’s guide to transmission lines.
• The Whys of Transmission Lines Part 2
  QST February 1965, pp. 24-26
  Standing-wave ratio and line losses
• The Whys of Transmission Lines Part 3
  QST March 1965, pp. 19-22
  Putting the antenna and line together
• The SWR Obsession
  QST, April 1994, pp. 70-72, 74
  What is your SWR meter really saying?
• The Lure of the Ladder Line
  QST December 1993, pp. 70-71
  Discussion of some advantages to using ladder-line in place of coax to feed multiband dipoles.
• Let's Talk Transmission Lines
  QST June 1997, pp. 57-59
  Coax or ladder-line? Which dielectric? How do I reduce losses?
• Opening Lines: A Short History of Coaxial Cable
  QST August 2001, pp. 62-64
  Nothing technical, just why coax is.
• Don't Blow Up Your Balun
  QST June 2015, pp.30-38.
• Improved Version of Transmission Line for Windows (TLW) article
  QST June 2014, pp. 38-40

• Transmission lines  Transmission line concepts and an online transmission line calculator by Owen Duffy, VK1OD
• Transmission Line Details by Dan AC6LA.  Free Windows program for calculating the loss and impedance transformation.
• Kenneth L. Nist, KQ6QV has free software for calculating arbitrary transmission line impedance, as well as transmission line equations for Mathcad 11.
• Arbitrary Transmission Line Calculator (for transmission lines and directional couplers) by Dr. David Kirkby (G8WRB), who works at the department of Medical Physics, University College London.
• Transmission Line for Windows (TLW) Software (updated June 2014 - zip file for download)

Sometime available for free or very low cost, many hams would like to know whether cheap 75 ohm TV coax can be used for ham radio. If a transmatch is normally used, as in the case with the popular G5RV multi-band antenna, there will be very little difference substituting 75 for 50 ohm cable.  As will be the case with a  600W tube type amp, which has an adjustable output network that can handle a minor SWR mismatch.  It is tough to solder to the aluminum shield of RG-6, but compression crimp BNC or F connectors are reasonably priced and adapters can be used to connect them to UHF connectors.

Using 1/2-Inch 75-ohm CATV Hardline, QST, The World Above 50 MHz, January 2000 p. 91.
How to attach PL-259s using hose clamps and a homebrew aluminum adapter sleeve.