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To eliminate it altogether, install active lowpass filters. Chebyshev-inspired response ripple compensates for the residual droop. The red curve is with no tuner load, blue is 47kΩ || 470 pF, and green is 100kΩ || 1000 pF (IEEE). Use part values within 2% of the those shown. Use a wideband, dual op-amp with rail-to-rail input/output rated for VCC = 8. 5V, such as a TLV2372.