Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to build antennas [title] Choose the rod length for your antenna. [step] 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. [substeps] You will need 2 rods that are 42.4 inches (107.5 cm) long if the antenna is for listening to fm band stations.

Ending1: [title] Understand your antenna's shade profile. [step] The pin at the bottom of the antenna should give the antenna a fixed shade profile. Ending2: [title] Choose 6-12 rods for the antenna or pole too. [step] Once you have decided which rods you would like to use and they are securely arranged the rods should rise above the ears of the antenna. Ending3: Two rods that are 27.4 inches (55. 84 cm) wide each will work well if you have two antenna lengths to choose from. Ending4: [title] Place your rods perpendicular to each other and tie them together with a piece of string or tape. [step] You might need to tape together extra pieces to brace the frame.

Answer format: ending1/ending2/ending3/ending4