At this point, I
really think the only thing that could improve my DX'ing capabilities
would
be a new location. I cant make bigger antennas, because they overload
even
my R-75 with the local 50 kilowatt medium wave stations. New and more
expensive radios wont help either, because of the general noise levels in
the very densely populated area that I live in. I've come to the
conclusion
that the bottleneck for me is just my location and not my gear.

Mike, you have probably hit the nail squarely. I can tell you from my
experience
that dxing weak sigs in a big "noisy" city is a hopeless endeavor. After
moving to
a semi-rural area the difference was enormous. I finally learned to
understand
what a receiver's noise floor limitation meant.

Take your R75 to a quite country location as far out as you can for a
weekend
and you to will be surprised of even the most modest receiver capability.
Of
course you can spend more bucks on a Welbrook loop, etc...