I would go with a large directional antenna for the primary, general purpose feed for day to day viewing.
A secondary antenna can be added if you want. The secondary antenna can be fixed or rotating... your choice. Some would use a large antenna, capable of DX reception, others might only want to make one particular signal reliable.
An A/B switch or auxiliary tuner makes it easy to use the secondary feed.
http://forum.tvfool.com/showthread.php?t=2882