Topband: QRP in CQWW from condo

[Jim F.]

Didn't do well from NH.   A new inverted 150' sloping inv. L with two 130' raised radials
heard many more EU than usual from the condo but very weak.  Did manage
a G4, F5, and C6.
 
Planning to change the sloping part of the inv. L to vertical (40') for the next contest
and hope for improvement.
 
With the two raised radials connected the SWR did not change when some on-ground
random radials were connected.
 
A question:  
Using the 2 above ground radials should the house/rig/A.C. grounds be isolated from them ?
 
It seems like the 2 above ground radials control antenna impedance and not much change
 when house ground and random on-ground radials are connected.
 
BTW on 20m worked P75T in Zone 25.  An Asian site posted a North Korean location
for that call.  Anyone have info on that ?   Apparent bootlegger ?
 
Fun contest with many tremendous 160m VE signals.  
Heard HK1NA pretty well but no QSO on 160. 
 
73
 
Jim / W1FMR