The barrier comprises a sheet of {HEAD ~ dielectric material} positioned over {TAIL ~ the upper surface} of a shed but spaced away therefrom, the sheet extending radially outwardly to overhang the periphery of the shed 
positioned over
The barrier comprises a sheet of { HEAD ~ dielectric material } positioned over { TAIL ~ the upper surface } of a shed but spaced away therefrom , the sheet extending radially outwardly to overhang the periphery of the shed
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH