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My suggestion is to use transformer type. As ur frequency is just 400~500 Mhz.
If u r ready to waste so much power just to match, then resistive is ok.
All VHF /UHF 300 ohm to 75 ohm convertors r of transformer type.
For a single frequency a LC pair will perform this matching but over a wideband, "Wideband Ferrite Core Transformers" must be used to convert 75-50 impedance scaling..
Resistive dividers are very lossy..