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I don't have concrete walls. I placed mine approximately 25 feet away from my router. Improved enough that we no longer have connection issues on our lg tv in master bedroom and guest room Insigna tv which are both approximatly another 20 or so feet from tp link device. True improvement considering neither could use smart features. Daughter hasn't had issues using her notebook anywhere within are 2000 square feet home. Nothing but complaints before. This item definitely improved our internet access on all our phones as well. Glad I bought it, only wish I'd tried it sooner considering it made such an improvement for under $20.
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