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We study the e-polarized beam wave guidance and scattering by a chain of finite-size reflectors modeling quasioptical beam waveguide. The incident complex-source-point (CSP) field simulates a beam generated by a small-horn aperture. Numerical solution is obtained from the coupled singular integral equations (IEs) discretized by using new quadrature formulas of interpolation type. The analysis shows that the edge illumination of the nearest to the feed reflector plays a crucial role and should not exceed -12 dB.