80m top loaded vertical

My 80m DXCC is far behind compared to other bands. Main reason is lacking of a good antenna (at the moment i have bended wire) and also not doing that much operation because of that.
Based on this situation, i have decided to go for a homemade top loaded vertical, i cant buri any radial cause i will install on top of the building that am living, however, couple of 1/4 waves radials will be installed.

I did my investigation and also performed my calculation with "low band dxing" book from on4un. I will use aluminum pipe with the following diameters in inches: 1/2, 5/8, 3/4, 7/8, 1". On top of that the hat will be installed which is a 2m diameter hexagon made with 3/16 aluminum solid.

Must probably i will start with  this project in the 2nd week of december cause meanwhile i need to study for my IELTS exam.

I found this program very useful for top loading calculation, give a lok to it.

http://www.smeter.net/antennas/short-top-hat-loaded.php

anibal,
hk3r, 5k3r