It looks like this Part has been superseded by LEGO Part 3957b Antenna 1 x 4 with Flat Top.
There are two known mold versions of this part:
3957a Antenna 1 x 4 with Rounded Top
This is the original version, introduced in 1979. The top of the antenna is rounded. This version is known in LEGO Digital Designer as 30064.
3957b Antenna 1 x 4 with Flat Top
This is the modern version, introduced in 2010. The top of the antenna is flat. This version is known in LEGO Digital Designer as 3957.
The mold comparison image shows both versions. If unsure, use the modern version 3957b.
Click on a colored part below to see the Sets and MOCs that use part 3957a Antenna 1 x 4 with Rounded Top in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.