Topband: Shunt fed tower question

[Mike Brown]

My tower is just 40' high, with a TH3, 10 ft of mast then a 17 ft Comet 
UHF/VHF antenna on top of the mast. Is a shunt  tower out of the question? 
My lot is also small at 50 x 130, with a detached garage taking up 25 x 25 
in the back yard. I have used resonant dipoles with the zig zag approach, a 
1/4 wave inv L  that did some zigging and zagging and it did have an SWR of 
2:1, but I would only need around 70 ft, maybe even less, of coax. The last 
plan I've had is to put un another inverted L, with a loading coil just 
after it starts going horizontal. Without much in the way of room, my radial 
system will use only around 15 radials, only 50ft in length. I need to quit 
procrastinating and get something done before Friday evening.

Suggestions?

Thanks... 73, Mike K9MI