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Re:The Size of the Human Radio-Broadcast Bubble in the Milky... by mchouza on Sunday February 06, 2011 @12:03PM (#2185939)
There is an analysis of the detectability of human radio signals at:

http://www.faqs.org/faqs/astronomy/faq/part6/section-12.html

The main uncertainty is at estimating the level of radio technology that can be available to alien civilizations.

Re:The Size of the Human Radio-Broadcast Bubble in the Milky... by ceejayoz on Sunday February 06, 2011 @12:41PM (#2186011)
Not to mention whether they'd even bother with radio, if better technologies become available.