rtmp URL without Playpath?

[zaguerinho]

I'm trying to capture this URL , I found the URL using URL Snooper.

rtmp://aguascalientes.audiovirtual.com.mx:7020/radiouniversal

If I try to capture with rtmpdump I get the following...

rtmpdump -v -r #rtmp://aguascalientes.audiovirtual.com.mx:7020/radiouniversal
RTMPDump v2.3
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
ERROR: You must specify a playpath (--playpath) or url (-r "rtmp://host[:port]/playpath") containing a playpath

I've tried adding -y /universal or -y / etc... with no luck ... is the URL incomplete as reported by URL Snooper?

The original page is this:

http://www.radiouniversal.com.mx

Thank you for any help.