I agree, but the MA-ANT-27 is still wide enough (120º) while covering at least 90 meters depending of course how high it will be mounted over the buses since those buses will probably be quite formidable obstacles for the signal.   MA-ANT-25 does not provide much more coverage directionally than the MA-ANT-20 so in my experience the 27 is the best match for somewhat longer distances 60 - 100 meters. ... View more