One of the most interesting and fun parts of Amateur Radio for many Hams, both newly licensed or OTs, is making and using there own antennas. This page contains some Internet references and information that will help you along the way.
K8ZOA's Handy Reference Guide - The Handy Reference consists of two page PDF of an 8.5 x 11 inch sheet chock full of useful tidbits of reference data. It covers everything from the formula for capacitance to a wire table in a one page cheat sheet.
Need a portable HF antenna .. or something that is temporary but works great? Here is the WØSJS 2-wire radiator HF vertical (you may have seen this antenna in action at the SLSRC Field Day or the ARES SET), and as a companion component here is the WØSJS wire radiator calculator for this antenna system as an Excel file. NOTE: This antenna will work well on 40, 30, 20 and 15 meters but requires a tuner since some of the bands are resonating on an odd multiple of the fundamental quarter wave. WØSJS uses it very successfully with a Ten Tec Jupiter with the build in tuner on both CW and SSB.
Coax Reference and Coax Calculator (From Orchard City ARC in British Columbia, lists all the possible coax and at the bottom of the page you can choose the coax and then calculate the loss for your system)