Can an opamp be used in a 75MHz narrow band pass filter?
A strictly passive approach might be investigated. Since the AD8307 has balanced inputs having differential impedance of 1100 ohms, a filter can serve two purposes: match the 72 ohm dipole impedance to 1100 ohms, and filter unwanted frequencies. The data sheet gives values for an unbalanced filter for various frequencies (fig.35 High Frequency Input Matching Network).







simulate this circuit &ndash; Schematic created using CircuitLab
The matching network shown above is a quickie attempt that's roughly in the right ballpark for 75 MHz. Out-of-band attenuation may be insufficient to knock down strong signals in a noisy environment...the bandwidth of this device is very wide.