Hello LowFers.
This weekend I proved one old truth. ANTENNA is the best amplifier. I made inverted L 
ant, where the vertical part was 21 m, the horizontal part is 32 m, most of horizontal 
part is in height 15 m above ground. Ant is stretched up to a high slope, so it is 
actually someting between inv L and a vertical ant. I tuned and matched this antenna with 
home-made variometer and some big coils. I was surprised. Signals came up few tens of 
dBs. Ground noise moves S-meter around S1 even during day, RTTY stn from Greece peaks S9 
+ 10 dB in night, DBF39 is all the time above S9 + 40dB. Now I feel no need to make any 
preselector, preamlifier or anything. IC-751A seems to manage theese signals. My 
listening was interrupted by heating in stoves and by ice hockey championship (hi...). 
This is the log here (reports given "by ear", not by S-meter):

15.5. 1320  136.9   DF2PQ     549  QRN,  cq cq...   (callsign perhaps wrong)
       1645  136.8   DF2PY     589 cq cq...
       1757  136.2   OZ1KMR  579  cq cq...
       1950  136.8   IK5ZPV     559 QSX 1837, gave JN53KX name VALT
16.5. 0610  136.9   DF2PY     589 worked DJ5BV gave 569 op WOLF, qth nr BINGEN  
JN49AX
           52  137.1   DJ7RD     529  cq cq...
       0735  136.9   I5MXX       529  cq cq...
       0811  136.7   DF2PY     569   cq cq...

The strongest signal was from DF2PY. Sometimes it seemed to me that he is on 
80m band, not on 2 km. For one of the next weekends I prepare even longer ant, 
better ATU and I try to get 136 kHz signal from my tcvr. I believe that it must 
be present somewhere around first mixer. Only to tap the right point to have 
signal for PA.

73 Petr, OK1FIG