Good Cheap Radioshack Antenna?

[kbpilot5]

I live about 2miles from my airport and I would like to pick up the approach/departure controllers better. I pick Tower up amazingly well. I use the radioshack pro-528. I like it. But can someone tell me a good cheap add on antenna from radioshack. Perferably a indoor or a small outside one. Is there free ways to pick up better signal like hooking it up to the computer? Sorry kind of new. Thanks everyone.

[Lezam]

I used to use this antenna until it broke. It picked up frequencies very well, then one day just fell apart 

click here

[kbpilot5]

thanks did you have to order it