The simplest solution for you, especially for 160 meters, may be the Alpha 
Delta DXB single wire sloper. It's a single wire that is 60 feet long, with 
a loading coil that causes it to play on 160, 80, 40, and 30 meters.

This antenna is a compromise on 160, but actually works pretty well on the 
other bands.

The feed point is mounted near the top of a tower, or other support 
structure. The wire then slopes downward like one leg of an inverted v, and 
is supported on the far end by a convenient tree, stick of pvc, or whatever 
works.

With only a vhf/uhf antenna atop your tower, you will probably need to run a 
ground wire from the mounting point down to a good ground in order to make 
it work properly.

You can read more about it on various web sites.

The taller tower would also give it a slight advantage.

I ran it's big brother, the DXA twin sloper for several years, and I'm 
considering installing another one before the 160 meter season begins this 
fall.

The twin sloper needs almost as much room as a full size 80 meter inverted 
v, so it would be a tight fit for you.

Any antenna this small is a compromise on 160, so take the manufacturer's 
performance claims with at least a grain of salt.

Even at its $100 more or less price, it's cheaper than the military type 
folded dipoles, and will blow them right off the band in most cases.


My two cents,

Mike, K5XU