FTP user creates file that are not executable by apache

I am facing a little issue: I have created an FTP server with vsftp and a web server with Apache 2.2.

Now, my goal is to make so that anyone can log into the machine via FTP and upload files (.html, .php) so that they are executable by apache.

The point is that they aren't. In fact, the files get created with 600 privileges, and with owner "ftpadmin". Apache returns an error.

Do you know a quick way to fix this?

Thank you,

Riccardo