| you might try making a dissimilar XY pair of the 87 and the 103, with the 103 pointing towards whatever side the trumpet is NOT on. Unless the room is really soupy, I often find that if it's a horn section going into an otherwise busy arrangement, miking them as a section sounds better than blending individual close mics.
If you go with this approach, the key is getting them positioned for an appropriate blend (ie, trumpet a few steps back).
I once had a horrible time recording a similar section and couldn't get the blend without the trumpet blaring until we had gotten a few shots of single-malt into the trumpet player. So, you might also want to have some scotch on hand in case you need to soften up your trumpeter's embouchure.
-dave |