Optionally, {TAIL ~ one or more antenna energizers} are provided on {HEAD ~ a rig and reader apparatuses} are located elsewhere 
Optionally , { TAIL ~ one or more antenna energizers } are provided on { HEAD ~ a rig and reader apparatuses } are located elsewhere
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH