I figured this out. I was using the incorrect URL. The URLs for Radicale look something like this:
https://myhost.com/radicale/myusername/12345678-1234-1234-1234-1234567890ab/
and I had to create this by going to https://myhost.com/radicale/ and log in to the webpage. I had to create separate calendar and contacts and add 2 separate accounts.
Is it normal to have 3 seperate accounts for my server? (an imap acct, a calendar acct and a contacts acct)? I was wondering if I set something up differently that eM would have noticed the calendar and contacts acct the first time when I added my imap acct and grouped them all under a single acct?