In order to use your gutters as a TV antenna, you will need to connect them to a coaxial cable. The cable will then need to be connected to your TV. You may also need to purchase a signal amplifier in order to boost signal strength.
If you are looking for a cheap and easy way to improve TV reception, using your gutters as an antenna may be a good idea. However, you may want to consider purchasing a dedicated TV antenna if you are looking for the best possible signal.