so that sealing contact is maintained between the elastomeric layer 38 and housing 22 referring to fig6 and 7 an exemplary prior art tool includes a housing 50 having a circumferential groove therein a bracket 52 secured within the groove an antenna loop 54 secured to the bracket 52 and an elastomeric layer 56 bonded within the groove and surrounding the antenna loops 54 fig6 shows a tool and an unstressed elastomer layer 56 fig7 shows a schematic representation of the deformation exhibited by elastomer layer 56 when the tool is subjected to elevated temperature and pressure in a downhole environment the deformation shown has been greatly exaggerated for the sake of clarity the elastomeric layer has a nonuniform thickness and the relatively thick central portion of the layer undergoes a more pronounced dimensional change than the outer portion thereby generating forces which tend to peel the elastomer layer 56 away from the housing 50 failure of the bond between the elastomer layer 56 and the housing creates a potential fluid leak path to the antenna loop 54 when the elastomer layer of the prior art tool was damaged or worn out the tool would have to be removed from service and shipped to a remote facility for repairs the device of the.