Here's a link to your original thread:
http://forum.tvfool.com/showthread.php?t=15871
If you get your usual reception with the old antenna and nothing with the new antenna and this is the only thing in your set up that you are changing, that suggests an issue with:
1) The connections. Check to make sure it is tight.
2) The balun. Are you using a new one with the new antenna? If so, it may be bad.
3) The antenna. Inspect it to see if the rods connecting the elements together are not broken anywhere.