What, exactly, are you trying to hear? Antennas are frequency specific, so you need an antenna that's designed to receive on the frequencies you want to listen to.
Also, antenna on top of a hand held radio inside a home is about the worst scenario you can have for listening. Add in that it's a $30 radio with a wide open front end and minimal filtering, inside a home with a lot of RFI generators. If you want to hear "something", you no doubt will, but if you want to hear something specific, you need to get a good antenna installed outside the home unless the transmitter is nearby.