this is more commonly used in greenhouses i think.
are you trying to monitor brooding chicks?
if you just want to know the next morning how cold it was the night before you can get a min/max thermometer.

I bought an Oregon Scientific long range thermometer for my greenhouse - it goes to 300'.

Thanks Randy and amiz!

I have a Radio Shack one, but I'm not sure of the distance on it. Works awesome. And has max and min temp. Keeps them until you clear it. I just clear mine every day so I can keep track.

Thanks again everyone,
We have a Radio Shack in our town, and their website lists a "wireless long range temperature/hygrometer" instrument. Looks fairly inexpensive too. I just didn't know where to look, and it was close by all along. Thanks for your help!