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As we all know that jammers can block the transmission of signals from the relative networks. Then the mission of Signal Jammers for UHF VHF is what? It is time to know the truth. This type of signal jammer has its frequencies tuned in the special way, the frequencies is VHF 140~180MHz and UHF 420~480MHz, keeping working 2~3Hours by battery. Here www.jammersall.com will offer you with the best choice.