Bug - is this your own house?
If so, you can replace any of the old coax (anything not marked, or rated for less than 900MHz) which will get rid of the rolloff on the high frequencies, you should then have too strong a signal uniformly across the board.
RadShack has
this, an infinitely variable pad but I'm not a huge fan of having a sweep pot left in a signal path.
A bit of guess and check with
these would be more my style... try maybe 10dB, if the ghosting goes away but the channels get snowy, it's too much, try a 6 or 3dB.
(Not pushing any of these site/distributors, just giving you an idea what to look for, both also pass DC in case you have cable internet or for use with satellite systems)
There are also slope compensators that would make up for your cable loss without replacing it, but trying to find one that matches your loss pattern would be mind-boggling.
Bren R.
