Bluefox get your antenna OUTSIDE of the house. According to the specs that should be a pretty good receiver especially with collins mechanical filters.
Don't use a piece of twin lead. What you want to do is order you some 450 ohm ladder line wire, This will be your feed line. On one end of the ladder line attach it to the wire ports on your receiver, and the other end you'll want to use something as an insulator, you could buy one commercial, or just use something like a plastic coat hanger (cut to about 3 inches with a hole drilled in each end) or a piece of wood about 3 inches long with a hole cut in each end. Then about 50 feet of Speaker hookup wire. Take the speaker hookup wire and separate it into two pieces 50 feet long, on one end of the wires remove some of the coating to expose the copper wire. Take the other end of your ladder line ( that isn't attached to the back of the radio) and do the same, remove some of the coating to expose the bare wire. Now you're going to take your insulator and attach one of the 50 foot wires to one end of the ladder line through the hole of the insulator, and do the same for the other 50 foot piece and ladder line.
You'll want to find something to hoist that insulator up as high as you can get it off the ground, use a tree or mast etc. and then find a tree or mast or structure (fence side of house etc) to support the two 50 foot wires. Pictures of what I'm talking about below.
Ladder line:
Construction, ladder line meets the 50 foot wires with an insulator.
another view of the antenna extending over the house into the yard.
Picture of a commercially made antenna like the one I described:
