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GPS Blocker/Jammer, High-Power, All-Band, $800. GPS signal-blocker, high-power (8 watts per band), all-band (L1/L2/L3/L4/L5), 5 antennas block all 5 GPS bands simultaneously to thwart the newest GPS receivers that can hop to other GPS bands when no L1 signal is present. Range is about 1/8 to 1/4 mile radius (in all directions) from unit depending on obstructions, so your circle of protection circumference is double that. Strong enough signal to ... 9/5/2016 ~ Cleveland, Ohio