Another option is to erect a portable antenna when the opportunity exists.
I would use a 3-way mount ((For illustration only): http://www.radioshack.com/product/index.jsp?productId=3088301
with a CGT-144 with 2 matching radials for 10 meters on my deck.
I would take it down when I was finished.
You can also use the same mount with quarter wave lengths of wire cut to frequency.
After mounting the 3-way on the ground and a reasonable distance from the house,
attach the 3 wires, (radials and radiator) getting the radiator as high off the ground
as you can get it, even if you have to have it sloping.
If you don't have trees, mount the free end to your highest window in the back.
You're gonna need a bolt to match the threads of the antenna portion of the mount
and I've found them at any hardware store.
Or, you can do the reverse, as this URL shows (for illustration only)http://www.qsl.net/wb3gck/2ndstory.htm
GL & 73.
Where there's a will, there's a way.