The rigid helium balloon has a helium compartment and a separate, channel
portion. Helium gas is filled into the helium compartment through a valve
in the balloon. Fiberglass rod members are inserted into the channel
portion to help retain the desired shape of the balloon. The rod members
also provide a counterbalancing weight which prevents the balloon from
floating upward. Thus, the balloon, once released into the air, will
retain its shape and remain floating at the height from which it was
released unless repositioned. No additional weights or tethering devices
are required to prevent the balloon from floating upwards.