Step 1: Lets see the materials
the most difficult of them is the copper wire...in my country can be found in hardware stores in pieces of 2m each. If you can use anything else might be ok. ABout the RCA connector i will explain in farther step why we need them but if dont want them skip this material too.
Also you will need a bench press for manipulating the copper wire
All the construction costed less than 10 euro (14USD)