p) said mobile stations on aircraft have {HEAD ~ a transmission power output} which is substantially lower than {TAIL ~ the transmission power output} of a mobile stations on land vehicles 
is substantially lower than
p ) said mobile stations on aircraft have { HEAD ~ a transmission power output } which is substantially lower than { TAIL ~ the transmission power output } of a mobile stations on land vehicles
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH