The paper presents an adaptive solution for the realization of ad hoc wireless sensor networks suitable to transport large quantities of data over narrowband channels. The electromagnetic front-end is specifically designed to maintain radiation efficiency even when inserted in media with random dissipative characteristics. The use of narrow band channels, as well as the possibility to decrease the carrier down to 180 MHz (compatibly with regulatory authorizations), provides robustness to interferences, lower signal sensitivity, and non-line-of-sight coverage. For all these reasons, the platform is being applied to cultivations, to construct an effective and low-cost instrument, which facilitates sustainable agriculture.