Watched rectangular shaped amber colored UFO perform S turns, change shape and exit atmosphere at impossible speed and left an ion trai

On a hot summer night 30 years ago, my brother (a marine engineer) and myself(a college student at the time) were fishing in an inlet near the mouth of Tampa Bay. The night was quiet and clear. Suddenly, my brother startled me by exclaiming " What the hell is that ?!". He pointed to the eastern horizon and there just above the water was an oddly shaped RECTANGULAR object (it had 90 degree corners). The amber color object appeared to just hang motionless for about 30-40 seconds. It was tilted at a weird angle. Shortly thereafter, the object started to slowly move in our general direction with the same odd tilt. As it moved towards us, the object moved higher in the sky. It was nearly 90 degrees straight up when it instantly disappeared. Then about 5 seconds later, the amber color craft reappeared but this time it was CIRCULAR or SPHERICALLY shaped. It continued moving due west for a few more seconds when it made a 90 degree left hand turn which brings the object in the sky above our heads. It then began a series of impossible S turns above our heads. We became concerned that this object was too weird and close for comfort so we threw our fishing gear into the truck and started the engine. At this point, the object finished one last S curve when it suddenly accelerated into an incredibly fast and impossible upward corkscrew movement that took it straight up and out of the atmosphere. The corkscrew exit from the atmosphere lasted only 3 to 5 seconds ! Left behind in it's wake, was a glowing corkscrew shaped ion trail in the sky that lasted about 45 seconds. We were completely dumbfounded but assured each other that whatever it was that we saw had defied the laws of physics and human technical knowledge. The entire sighting lasted about 5 minutes. There was no sound whatsoever. The object remained several thousand feet above us but was possibly the size of a large airliner or bigger. Note that there was a report of a similar UFO by a seperate witness about 10 away miles. This sighting was in the vicinity of MacDill AFB over Tampa Bay.
Witness indicates that the date of the incident is approximate.  PD