Often times there is a need to do remote monitoring. The remote sites may be located far away; thus, traditional connectivity, such as fiber, is not possible. This paper proposes to use unmanned aerial vehicles (UAVs) to provide connectivity to ground sensor clusters on a suburban industrial area. Very small, commercial scale UAVs can be used to monitor a bunch of ground sensor nodes without the dependency of a physical connection to the remote sites. This technique can be used to create modular sensor grids with very low cost. The proposed research is to define the best ad-hoc network parameters for supporting the maximum number of programmable logic controllers (PLC) from a reasonable altitude using very small size, commercial UAVs. As a result, using IEE 802.11 with Dynamic MANET on Demand (DYMO) routing protocol can support five PLC clusters, which have 10 nodes each, from a 100-meters altitude with less than 350-milliseconds delay.