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As far as I can tell, what differs is the indoor antenna design and also the signal gain
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I verified that this antenna was compatible with my verizon samsung and iphone phones frequencies and ordered the kit.
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Its important to sepetate or isolate the antenna from the amp for maximum gain.
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This antenna improved my cell phone reception tremendously.
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The antenna on the repeater works as the indoor antenna
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I bought this less expensive antenna just to see if it would allow me to have a conversation in my living room without dropping the call and having to drive three miles to get a good signal
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(External antenna should be mounted with elements vertical, but it works great horizontal)