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In this particular case, the player needs Electrical Repair. Mechanical Repair will let them make the antenna mechanically sound, but not test continuity. If a player has Mech Repair but not Elec Repair, the Keeper can allow them to roll -- but should then feel free to have the antenna be too noisy to use reliably.

In general, any short task should only need one skill; an extended task -- say, building a new antenna mast and connecting it up to a transceiver -- could require multiple skills. They don't all have to come from the same player.

Keep the game moving and make sure that every player has something to do.