Just thought i would share an idea that Mid, gave me when i started setting my foxpro up like his.

Most every body has a smartphone now, and you can download several apps that have very good distress sounds on them.

Go to radio shack and pick up a mini audio amplifier, model number 277-1008C, and a headphone cord that has the jack on both end. You will also need a 9 volt battery to power the amplifier.

Download an app, plug one end of the cord into the amplifier, and the other into the headphone jack of your phone. Turn the amplifier on and play your distress sound app.

This is EXTREMELY loud and will be plenty in most calling situation.

Isaiah 40:31.... Those who wait upon The Lord .....shall renew there strength ......