Topband: 4L spacing question on TB

[JAMES]

I have been trying to study impact of spacing on RDF etc with the DXE 4L receiving system using 106 inch active vertical antennas with phasing. Their ad says 54 ft min spacing on TB. My spacing would come close to that on our small lakeside lot. Two elements would be anchored in the lake. It is possible to stretch from a square placement to a rectangle 54ft x 100ft but am afraid that would really cause issues. Lot is too small for BOG and K9AY would really messup lake vista. 

I do not have modeling software or skill sets to evaluate all this against RDF. I am fortunate to live in a quiet, rural setting as far as manmade noise is concerned. When atmosphere is quiet, noise background is S1 to S2. Before shelling out $2K for antennas, NCC-2 etc, I need to understand what impact a compromised installation could cause. TIA 

73, Jim K7EG