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It is impossible to say based on limited information. There is not an easy yes/no answer, nor is there some magic "dBi" number that will insure that your signal reaches a given distance.
Because you are dealing with 2-way radios, it is dependant on the ERP at both ends. Do the math, and you'll know.
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Thorn
"Read Altas Shrugged. Compare it to today. Repeat as necessary"
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