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What frequency are you trying to receive?
I would imagine that the wavelength is far to long to use an internal antennae. To calculate the wavelength, divide the frequency in megahertz into 300 (the speed of radio propagation is 300 million meters/sec). The answer will be in meters and your antennae should be electrically about 1/4 of that wavelength. Electrical length may or may not be the actual length of the antennae.
For example, it I wanted to receive something in the range of 15 megahertz, I would be dealing with a 20 meter wavelength, so I would want an antennae that is 5 meters long. That's a pretty long antennae, so the manufacturer would make it appear electrically longer by adding a coil to an antennae that is somewhat shorter than 5 meters.
That's why they are recommending an external antennae. By the time they electrically extend a small piece of internal antennae to be 5 meters, they have destroyed its sensitivity.
PS.....Look into using your back stay; that's long enough.