So far in comparing the two horizontally stacked XG91s vs. the Finco P-7 parabolic, it seems that the P-7 is a little more directional, with a more narrow beam width. More info here on beam width. http://www.hdtvprimer.com/ANTENNAS/GlossaryA.html#beam Greg B. has found that a quad stack of XG91s is more directional than a stack of two.

The more directional P-7 is good and bad for distant DX reception. It's good when attempting to get a decode from a weak DTV station when there is co-channel interference (CCI) and/or adjacent channel interference (ACI) as it is easier to find a null to cut down the signal level of the interfering station(s). As for using the autologger when unattended, the aim of the antenna becomes even more critical as being off the needed "sweet spot" by a few degrees could make or break the reception. Antenna placement (aim) becomes much more important. And after years of DXing ATV/DTV, many times it is a bigger factor in nulling the interfering station(s) than it is to have the antenna aimed directly at the station you are attempting to receive. Sometimes the "sweet spot" may be 5-20 degrees + or - the true azimuth reading.

The P-7 was able to receive three new DTV logs on Sunday, May 8. All three were less than 200 miles, but were low-power LD or CD stations: WYTU-LD 17/63, Milwaukee, WI @ 171 miles (Channel 17 usually dominated by WAND, Decatur, IL or WYIN, Gary, IN); WDNI-CD 19/19, Indianapolis, IN @ 99 miles (Usually CCI from WGN, Chicago); WOHL-CD 35/35, Lima, OH @ 182 miles (Fred V., finally got this one!)

More time and some better tropo conditions will provide comparisons between the two UHF antenna setups.
Click image for larger version. 

Name:	WOHL CD 35 may 8 2016.png 
Views:	45 
Size:	88.9 KB 
ID:	18724