A helical antenna has a helix supported by a helix support. The helix support
includes
at least one piece of flexible sheet having its two surfaces covered with a layer
antistatic material. The flexible sheet is curlable into a revolution surface configuration
to form a revolution surface-shaped support section for at least partially supporting
a portion of the helix component there around. A grounding mechanism electrically
grounds the external sheet surface to the helix and the two sheet surfaces to one
another when in the revolution surface configuration while a locking mechanism
locks the flexible sheet in the revolution surface configuration. The combination
of the helix and the flexible support renders the antenna structurally relatively
rigid in all directions.