On request of a number of people I added a section about my DIY aluminium push up mast under "PH0NO projects". This mast has allowed me to set up my 4 element 10m yagi and my hexbeam. In this way it is a vital component for my DX fishing.
It is quite heavy and not as practical as a fibreglass pole, but it does allow me to put either (or both) of the beams on considerable height - up to 14m in low wind conditions.
Check out the details here if you are interested.