What kind of planning are you doing? IM? Interference? Something else?
What is the frequency band for which you are planning?
What kind of modulation will the networks use?
How many base stations will you have and how many frequencies will you use between them?
Over how large an area will your network extend?
How much can you spend?
I am doing microwave link sites planning.
the frequency may be any frequency in the microwave band (3 GHz-300 GHz)
I think a modulation of PSK type will be appropriate.
the link is consisting of two base stations as a beginning.
and it extends to about 20 km.
I've used Celplanner and Mentum Planet and both would do the job but both are quite expensive, ~$50K per license. I have not used EDX but it is in the same category in both capability and price.
While 20km is a realistic distance, I wouldn't consider using over about 11GHz due to rain fade.