Flag poles are fine; I've had them at rallies in DC. I would suggest, though, using PVC pipes/tubes as the poles; the flags can be attached by cable ties thru the grommets. The reason: The standard metal pole in the average kit doesn't give enough height if you want to rest the pole on the ground yet keep the flag from touching the ground (to rest your arms). Those metal poles are usually designed to hang from porch railings so length for that isn't an issue. The DC chapter of Freerepublic uses the PVC tubes/pipes and hasn't had an issue at any rallies.
Remember folks it is only in the vacuum of dissent that the voices of liberals can overpower our own.
If I can drive a beat up forty year old mustang well over a thousand miles just to have my voice heard what is stopping your's from being added to the chorus?