Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Distraction; Situational Awareness
Inflight Event / Encounter CFTT / CFIT
Flight Crew Took Evasive Action; Flight Crew Became Reoriented
Environment - Non Weather Related
While descending to downwind to TYS 23R; the First Officer pointed out the known antennas in the vicinity to me. We received a Obstacle Warning followed by a Pull Up command. I started the Phase One. We at 3;300 FT descending to 3;000 for the visual to [Runway] 23R and as soon as I stopped the descent the warning stopped. I started my right base turn and landed uneventfully. I had slightly delayed my base turn and that is what triggered the GPWS. I should have started my base turn exactly abeam HIGAR and this would have managed this threat properly.
An Air Carrier at 3;300 FT descending on a right downwind for visual to TYS Runway 23R; received an EGPWS PULL UP command from known antennas in the descent flight path.