physical theory of diffraction

hi
i totally have zero knowledge on numerical techniques. i want to use ptd (not using commercial available software) to analyse antenna radiation pattern when attached on complex body. i want to read abt basic formulation in ptd. please suggest some book r materials.
thankyou.

my suggestion is to use commercial software...why re-invent the wheel?

Hi,

I agree with tallface65. You should try at least with a low-cost software, like ANSOF