Why doesn't F-15 have a protruded cone-like structure at its rear like what the Su-35 has?
Left one is Su-35. Right one is F-15.
Where is F-15's RWR?
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As @RalphJ notes, it is not required. It is a design choice based on various considerations. The 'cone' in the Su-35 houses the RWR and the drogue chute. In case of F-15, however, the drogue chute is not used and the RWR antennae are located elsewhere (in the wing and vertical tail tips, to be exact).
Integration of AN/ALR-56C Radar Warning Receivers on F-15; image from BAE systems