Pre-filter for RTL-SDR on HF

I did test my rtl-sdr dongle modified for direct input (0 to 30 mhz) yesterday. I get some radio stations, but a lot of the bands gets totally swamped by strong local FM stations. How can i build a simple input filter cutting off all above 30mhz (and maybe below 50khz)?

I am able to wind my own coils and i have most common C values here. The filter doesent have to be sharp, it has to be simple. I need to supress 90 to 110mhz (strong commercial FM) and 433mhz (city telemetry station).

submitted by /u/EssencialToLife
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