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This sounds like an instance of difference constraints problem

Can it be solved by graph coloring model?

WE NEED THE FREQUENCY TO GET THE TOWER WORK SPEEDLY ON THE 1.2 MEGA HERTZ FREQUENCY TO GET THE TOWER AND WE NEED TO MAKE MAXIMAM RANGE.THANK YOU.

Any sound replies??

I don't know the code, but the algorithm can be worked out. Assuming that each tower can generate only one frequency, 7 towers can be set up at a particular location. Thus considering it as the center, around the circle with radius 100km towers can be put up at the corners of a hexagon (7 towers at a corner) circumscribed by the circle. thus the towers will be at a distance of 100km from each other. Again, consider a corner point as a center and build the structure.