A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. A three-dimensional micro-structure has micro-columns with different micro-column materials. The invention also allows grain wagons to carry two separate types of agricultural material, such as stover and corn kernels. If required to de-power the kite, the release system will release the kite control lines which will deflate the kite and negate the kites strong pull force. The firebox of all embodiments is cast in modular sections. The beater rotates about an axis generally transverse relative to the combine and is divided asymmetrically along its length into a number of sections corresponding to the number of streams of crop each section of the beater having differently angled crop feeding members which direct crop towards a crop steam.