I think it can only be used with satellites within 19 degrees each other. The 38 degrees is around the center but is a maximum of 19 on one side and 7 on the other.
From the datastormusers.com glossary:
BOW
Bird-on-a-wire, pronounced as a word as in Bow and Arrow. Refers to an extension bracket and LNB that is attached to the side of the main Internet LNB and allows reception of satellite TV simultaneously with the Internet connection.
There are several BOWs available, allowing one or more of the following offsets from the Internet satellite: 10 degrees west, 2 degrees west, 7 degrees east, and 16 degrees east. The proper combination of Internet satellite, TV satellite, and BOW is necessary to get service.
The three kits are (see the links for pictures):
SatKitA is used to see 101 DirecTV from G4R 99, or 119 (Dish, or DirecTV HD) from SatMex5 117
SatKitB is used to see 101 DirecTV or 110 Dish/DirecTV from SatMex5 117
SatKitC is used to see 101 DirecTV from G11 91
There are DW satellites at 83, 87, 127 that may not work with the BOW because the satellites are too far apart.