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. 2018 Aug 29;18(9):2853. doi: 10.3390/s18092853

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Received signal strength vs. channel attenuation for reference RSS and (a) ODT ( $868$ MHz), Libelium ( $868$ MHz) and Uputronics ( $868$ MHz), (b) ODT ( $434$ MHz).