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How to build antennas 
Choose the rod length for your antenna. 
You will need 2 rods that are 46.4 inches (117. 8 cm) long if you are designing the antenna to listen to non-commercial radio stations such as college channels. 
You will need 2 rods that are 42.4 inches (107.5 cm) long if the antenna is for listening to fm band stations.
Place your rods perpendicular to each other and tie them together with a piece of string or tape. You might need to tape together extra pieces to brace the frame.