Understanding the problems and issues faced we checked what parts of the systems were usable and functional and propose an alternative improvement.  The installation was for a council so we opted to keep the working items and work on addressing the concerns, Keeping the multichannel amplifier we added a new radio microphone system, and housed everything in a lockable wall mounted rack unit.  For the aerials we fitted a direction Yagi aerial to give us good coverage for the concourse coverage, and an omni to pick up the rest of the running track.  Due to power restrictions on site the site container where all equipment was situated was tucked in a corner of the field therefore the aerial combination worked perfectly.  We repositioned the aerials to be out of simple reach as a basic form of protection.  Once reconfigured the whole system give reassurance that the unit can be locked and know nothing has been adjusted past the level knobs on the front.  The new radio equipment provided the range and resolved the connection issues the previous system suffered with.