Method of making a conical spiral antenna

摘要: A length of somewhat resilient yet deformable conductor wire is wound into a tight coil on generally frustoconical mandrel. The stretched axially inside the bore an elongated, antenna blank or casing such that convolutions consecutively engage inner periphery and are held against further movement. Liquid adhesive injected one end in upright position sets to secure casing. resulting conical spiral requires no core particularly adapted mobile use as car boat.