An inexpensive dipole antenna constituted of an extension twine
Dipoles are a classic construction antenna, after all they usually consist of little more than two pieces of wire and a lead. But [Rob] shows us in the video below, there are a few things to consider.
The first thing is where to get the wire. A damaged extension cord donated the wire. This is actually an interesting idea because you have several wires of the same length in the extension cord. Of course it’s easy to just pull the wires out of the extension cord, but how do you insert it? A small balun converts the unbalanced feed line into a balanced connection for the antenna. Although the title says “free dipole,” this balun is commercial and likely to cost something unless you already have one. Building a balun isn’t all that difficult though, even if you happen to have a ferrite toroid.
If you want to send you will likely need a slightly different arrangement, but it definitely gets it done for reception. A tuner would make life easier.
Although this is technically a dipole, without tuning it is more of a random wire. It does work, however, and with antenna analyzers that are now commonplace, it would be easy to shorten the dipole to any band you want.
Of course in the mechanical world they say if you can’t exactly get it, make it adjustable. If you’re looking for cheaper station equipment, there’s always the $ 50 ham, aka [Dan Maloney].