The most efficient tilt for photovoltaic panels in Omaha, Nebraska at a latitude of 41.26°:
Your photovoltaic panels need to be angled facing south.
If you're mounting the photovoltaic panels at a stationary angle, such as on your roof, the most efficient angle is 34.5°.
If you're planning to change the angle of your photovoltaic panels twice per year, the most efficient angle is 17.4° in summer months and 55.3° in winter months.
If you're planning to change the angle of your photovoltaic panels each season, the most efficient angle is 13.7° in summer months and 60.7° in winter months, and 38.1° in autumn and spring months.