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The efforts to increase reflection loss through material engineering on magnetic materials based on barium strontium hexaferrites have been carried out. The engineering of this material was in the form of lanthanum substitution in the Ba0.6Sr0.4-xLaxFe10MnTiO19 system (x = 0.05, 0.1, and 0.15) which was synthesized by the solid reaction method through mechanical milling technique. Crystal structure, morphology, complex permittivity, and successive complex permeability have been measured using X-ray Difraction (XRD), Scanning Electron Microscopy (SEM) and Vector Network Analyzer (VNA). Based on the results of qualitative analysis, it is showed that the formation of single phase ultrafine particles was successfully confirmed. Quantitative analysis of XRD data showed that there were changes in structural parameters along with changes in the value of x. The observation studies with SEM showed that the synthesized particles had hexagonal morphology. Reflection loss (RL) are -20.1 dB, -24.7 dB, and -20.3 dB for x = 0.05, 0.10 and 0.15, respectively. It was concluded that this material can be applied as a microwave absorber (RADAR).