said by lutful:
Using all three available frequencies at each tower to maximize his total wireless network capacity is just another option.
Yes but using only two frequencies per tower might also be an option and may in fact make channel reuse easier.
Until such time that the OP gives us more details, it is mostly conjecture.--
Strange as it seems, no amount of learning can cure stupidity, and formal education positively fortifies it. -- Stephen Vizinczey