Get a piece of RG-58 coax and using the chart below, strip the outer jacket of the coax to that appropriate length, depending on the band you choose to work.  Once the outer covering has been stripped, carefully open the copper braid near the bottom of where you stripped the outer jacket.  Once the braid is open, carefully bend the center conductor over and pull it out of the hole you opened in the copper braid.  Once you have the center conductor pulled free, straighten it and either form a loop at the top end for hanging, or solder on a terminal lug.  Remember, the antenna length is measured from the very end of the look or terminal lug, and they do add length to your antenna.  Trim as necessary.