You do not need to buy package lenths of wire. You can use any good quality 24 to 26 AWG stranded wire. For dual conversion full range Futaba Rx's the antennas are 39 inchs long.

If you have several inchs of wire outside the Rx case and this is a first solder job then stay.away from the circuit board, Splicing an antenna is fine but soldering on a board is a different matter and not the place to start learning.

To splice an antenna. Strip only about an eight inch and tin flow with solder each end sparately. Do not attempt to twist the wires together. Support one end with some sort of clamp I use an old wood furnture clamp so that it does not become a heat sink. Now with one hand hold the opposite end next to the other being supported in the clamp and touch the iron to the bare ends you will see the tin solder flowing together then just remove the iron and let cool a few seconds. Slip on you shrick wrap heat to shrink with lighter and you are done.

John