Bill N4QA uses the Gutter And DownSpout on his house as an Antenna, with a tuner mounted at ground level with coax entering the house at the base of the downspout. Click on the images for larger pictures of his installation.
Jake, N0LX, has some nice antennas on display at his site. One of the more interesting ideas he writes about on his site is the idea of using a spiral of wire or ribbon as a counterpoise to a vertical. No room for radials, then perhaps this will work for you. Check out his article on a spiral counterpoise for a vertical antenna.
Here is a link to a homebrew 20M vertical by W4INF, easy enough that an 8 year old can do it. Vertical wire and radials are all 16.5′ long.
VE3EIM Bob (now VE6RI) gave me this just before he moved from our area to Alberta. It has proven to be a good way to get antenna wires up into a tree.
Spam is a big annoyance when you have a web site. You get all of these comments, mainly from one particular IP address, which you have to process and delete. In an effort to prevent spam from cluttering up my site. I have added reCaptcha to comments. If you are a human and you want to comment on an article, reCaptcha will ask you to type in the two (2) words it chooses at random and displays, just below the comment form. In order for your comment to be passed through to me, you will need to enter those 2 words, no automatics system need apply.
Hopefully this will stem the tide and eliminate most of the spam comments, wish me luck.