Mike,
I think that the capacity hat is often an easier alternative than 
running a longer horizontal wire.  And if you are using any kind of 
inductive loading, the hat will ease the need for as much coil.  When 
I was a new ham, perhaps a century ago, I hung out with a bunch of 
guys who were on 160 mobile.  The idea of the besgt antenna was a 
loading coil above the roof line, the largest diameter coil form and 
wire practical, the longest whip that you could mechanically properly 
secure to the antenna and if you still wanted higher efficiency, a 
capacity hat above the coil.  There were some god awful looking 
antennaes on the back of cars, and seemed the uglier and more 
combersome, the better theyu worked!  We all learned a lot and had a 
hell of a good time at it!
Pat, K9JAUAt 01:51 PM 8/12/2014, you wrote:
>Steve:=20
>
>Your probably right. Sounds like a capacity hat but why would Butternut =
>use 4 wires instead of just 1?=20
>Isn't the idea to turn your vertical into an inverted L? Or is the idea =
>to create as much metal around the top of the antenna and the more wires =
>on the hat the better?=20
>
>Mike=20