I am having trouble making an effective bandpass filter for an antenna receiver. I am using a function generator to test out my circuits but when I get to about 400Khz nothing works. I tried the RLC bandpass filter and that seems to only be effective at lower frequencies. I also tried a low and high pass RC configuration and I'm getting the same frustrating results. I know how bandpass filter works when jwL + 1/(jwC) = 0 the circuit is purely real resistant so all of the voltage should be across the resistor (ignoring inductor resistance which a real inductor acts as an inductor and resistor in series). I also notice when my sig gen goes to high frequencies my meter reads lower and lower ac voltages. Could this be due to a slow multimeter that can't track high freq signals. Any advice is greatly appreciated! Thanks