Homepatrol Antenna Upgrade

I plan on upgrading the stock antenna that came with my homepatrol 1. I am going to put the radioshack 800mhz antenna on it.

800MHz Scanner Antenna - Radioshack

What adapters am I going to need to make the new antenna work?

If someone could give me the links to the adapters that I need that would be great.

Thanks.

Homepatrol Antenna Upgrade