I think you will do not have any problem! A many of phone use earphones as the external antenna for the radio signal. If you want to be sure one hundred percent you can cut off the speaking parts. Only wire be required for receiving of the radio signal!
Also cut it to the correct length, The length of antenna is very important in all radio communications. Reception and transmission.
The difference between stupidity and genius is that genius has its limits.
Albert Einstein.
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