I had a couple of questions regarding recievers that I haven't been
able to figure out. I'd appreciate it if anyone could give me some
insight...

How well-defined is the gain for a cap-coil loop, like in an AM radio?
(i.e., how fast does the gain droppoff as you move up or down from the
'tuned' frequency?) Is it a function of L and C? Or just frequency?
(different combinations of L and C will tune to the same frequency, but
is the gain the same?)

How come the coils on many of the CR schematics I've seen have multiple
tap locations? It seems that with a variable cap, you should be able
to tune to whatever frequency that's in your range. Is it to increase
the range of your radio's coverage? Or because the gain at certain
frequencies is better with different C/L combinations?

Thanks in advance for any insight!
Dave