function ant = fd4(h,x1,x2)

if nargin<3  x2 = 27.8; end
if nargin<2  x1 = 13.9; end
if nargin<1  h = 12; end

w{1} =  wires([0 -x1-0.1 h; 0 +x2-0.1 h],[0 -0.1 h; 0 +0.1 h],0.003,28);
w{2} = exwire([0 -0.1 h],[0 +0.1 h],0.003,1);
ant  = comment(construct(w{:}),'FD4');
