I'll let you know when I find out.
This season is the first I'll be bringing full size mics with me to marching band shows. Most professional companies I see that record the final shows of the competition circuit for DVD production use an X/Y cardiod pair on a very tall stand at the 50, just in front of the stands. Then they have 1 or 2 pairs of omni outriggers flanking the X/Y pair at around the 10 and 30 yard lines on either side. I on the other hand have to do this more run-and-gun style with just one pair of mics, as I only have the capability to record 2 channels.
For home games, I have access to the press box roof since I'm on staff. When I record, I am running video and audio together and that tends to be the best location for video to capture the whole band from a fixed camera angle (although quite distant for audio). So if I'm up there, I'm going to experiment the first couple of times - one show I'll run the omnis clamped to the railing spaced as far as I can, probably about 15-20 feet. The next time I'll try my cards in NOS (especially since my cards are really almost subcards). In this situation I have plenty of time to set up carefully, and usually the only other person who might be up there is a video guy for the football team.
For away games and competitions, I'll be able to be either in the stands or on the field directly in front of the band, but definitely not above the press box. If I'm on the field, that means I'm also on the schlepping crew for the pit equipment (podium, mallet instruments, synths, tympani, etc.). In that situation, it's a very much run-and-gun situation and I'll need to have everything set up very compact on a monopod with a flash bracket and various attachments.
If I'm in the stands as an audience member, I'll probably go with my cards in NOS clamped to bar if I'm right in front in the first row of stands. Otherwise, I'll again be holding up the whole thing on my monopod / flash bracket setup. I wouldn't use my omnis in that situation because I wouldn't have the space or time to spread them appropriately.