for this very simple project you need a smart phone or a ordinary phone with 3.5 mm jack, two small metal rods, an Insulation Tape,scissors , 3.5 mm jack either from an old head set or buy a new one for aerial
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Step 1: Take the Aerial and Remove the Back Cap As Seen in the Picture
Step 2: Then Take the 3.5mm Jack and Cut for the Suitable Length and Fix a Normal Size Copper Wire As Seen in Picture.Find the Most Signal Accepting Wire and Add the Wire
Step 3: Then Insert the Wire Into the Areal and Fix It With Tape
while you insert the wire into the aerial be careful that to place the small metal rods on the sides of the Jack to supply more strength to it
Step 4: Add Some Tape
it is better to add some tape before fixing the metal rods on the sides
Step 5: Add Metal Rods
wind the tape tightly