Differences between XBee Antennas

I may be looking in the wrong places, or merely passing over the paragraph on this on a page I’ve seen twenty times, but I have got to know one thing:

What is the difference between the wire and chop antennas?

Thanks in advance for any advice.

The Digi Knowledge database has an app note on XBee antennas.

Look at #17 in this link:

http://www.digi.com/support/kbase/kbase … kbkeyword=

Thank you, that page is quite helpful.