173 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was formed at Fareham in October 1942. The Regiment was disbanded in September 1945 at Bridlington, Yorkshire.
| Oct 42 | Formed | Fareham, Hampshire, UK |
| Oct 42 | Home Forces | UK |
| Sep 45 | Disbanded | Bridlington, Yorkshire, UK |
Batteries
| Oct 42 | 339 (Mixed), 390 (Mixed), 413 (Mixed), 416 (Mixed) |
| Dec 44 | 339 (M), 390 (M), 416 (M) |
| Jun 45 | 339 (M), 390 (M) |
Gun Sites Occupied
416 Battery
| Dates | Gun Site | OS Grid Reference | Gun Defended Area |
| 22 Jan-Sep 45 |
BJ BJ1 |
TB 040 827 (Approximate) | Diver site |