The file 'NOAA APT QFH Antenna 3D Printer Model' is (stl) file type, size is 280.0KB.
STL files for my desing of a QFH antenna for NOAA APT, simulated and tested with a vector analyzer to correspond with APT frequencies.
You can find the full guide on how to build it (along with some info on filters and amplifiers) on Instructables:
QFH_BODY.stl | 702.1KB | |
QFH_BOTTOM.stl | 95.2KB |