[Divingduck]

@atlanique
You may look here in the forum at the sticky thread "re-usable code", post 14 from kiklop74: link. This will exlain and solve your problem.
Here is an example how to integrate it your RSS-Feed:

Spoiler:

__license__   = 'GPL v3'
__copyright__ = ''
'''
Fetch Feed Antiwar.com
'''

from calibre.web.feeds.recipes import BasicNewsRecipe
class Antiwar_com(BasicNewsRecipe):
    title          = u'Antiwar.com' # 2011-12-28 AGe
    description = '-Antiwar.com-'
    publisher = 'Antiwar.com'
    category = 'RSS-News, US'
    __author__ = 'Armin Geller' # 2012-01-22 AGe
    language = 'en'
    lang = 'en-US'
    encoding = 'utf-8'
    timefmt = ' [%a, %d %b %Y]'

    oldest_article = 7
    max_articles_per_feed = 50
    no_stylesheets = True
    auto_cleanup = True
    remove_javascript = True

    feeds = [
              (u'Latest Viewpoints - Antiwar.com', u'http://www.feed43.com/8330834560181458.xml'),

             ]

    def print_version(self, url):
          return self.browser.open_novisit(url).geturl() + '&pagewanted=print'