with the radioshack one...
you put your antenna lead into the box. The wire coming out, goes to your radio, antenna input. Then it has an AUX 1/8" stereo jack on it. Go out from your headphone jack (on laptop, i guess) to input on that jack, and it will override your radio signal, whenever signal is present.
So plug in your laptop.. it works. Unplug your laptop, radio comes back.
works great. my bro uses it for his sirius
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