The Data sheet for the AD8338 sets the 3 dB bandwidth at 18 MHz. The .pdf list of VGA's sets the BW at 20 MHz and I'll assume that's just an oversight. I'd really like to use this part as an IF amplifier at 20.0 MHz with AGC enabled. This is a receiver used for unmodulated carrier reception. The curves suggest that the worst thing that might happen is that the gain is going to drop off by about a dB or so, beyond 18 MHz. Are there any other issues which would make the AD8338 an inappropriate choice for this application?