[Antennas] Traps

[solo22 at sbcglobal.net]

Hi....   has anyone ran across any software  allowing the user to enter 
a freq, and other data so as to get back info to constuct antenna traps 
on a given frequency?  My interest is for 5.3 mhz traps to build a 40/75 
mtr dipole (whole antenna radiates.)  I've built one using Rg59 coax for 
trap material but would like to play around using 12 ga wire and door 
knob capacitors.  I could spend a couple of hours with coils and a GDO 
but would prefer an easier way.  Any body got any ideas.   Thanks, Ron.