I needed an indoor HF antenna recently and had a 40 ft roll of Radio
Shack twinlead. I cut down the middle about 16.5 feet, hung one end at
one side of the room and the other end at the other side of the room and
fed it into the balanced line input on my tuner. It tunes easily. I
have no ground set up, so I ran another 16.5 foot wire from the ground
port. Making contacts is a bit of a struggle, from my QTH in Michigan
I've worked Nevada and Arizona on PSK and during the DX contest today in
limited operation near sunset I worked Barbados and the Dominican
Republic with about 50W (probably a bit of a high level of RF radiation,
I know). The question I have is what the downside of this is. I have
seen many websites that show various antennas fed with twinlead, but
I've never seen my approach (the twinlead used for both the antenna and
feedline). Since I got this roll of twinlead on clearance from Radio
Shack for 38 cents, this is a cheap antenna indeed.

73,
Paul, N8HM