I bought these for my Android head unit in the car. After reading the reviews I realized what they are for. If you're buying this hoping to improve signal reception for something that already has built-in antennas, this isn't for you. It is likely that the antenna designed for your device will work best. These are low signal antennas. So if you have a device that you need to connect an external antenna to, great. They got me down to 3 bars from no signal. If you need an antenna to boost the 4G signal from an already dedicated 4G modem (or similar), you need a stronger, actively powered antenna, not these passive ones. This product is REALLY good for the price, ships quickly with Prime and does the job within reason. Full buy recommendation.
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