wire antenna software

EZNEC
MiniNEC
NEC Win

There are many front ends for NEC.

The MoM-based simulators are very well optimised for wire-antenna modeling.

Take a look on EMC Studio product with easy to use GUI and very accurate and fast solution.

It's suitable to work with xFDTD, simple and accurate.

i recommend fecko, althogh fecko is good for reflector antenna, but it is also good for wire element