N-Cα-C=Oblock repeats itself in each sequence). Observe how the atoms involved in H-bonding align themselevs in almost straight lines: H-bonds in anti-parallel β-sheets are therefore much stronger tahn those present in parallel β-sheets.
As in parallel β-sheets, the sidechains alternatedly poit upwards ands downwards from the sheet plane. Spin the structure in order to fully appreciate it. See how one of the ends of the sheet contains polar, hydrophylic residues, while the other mostly contains hydrophobic residues (and therefore it probably faces the protein core)
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