SPA-3 Dimension: 605 x 605 x 76 mmFrequency range: 1GHz ~ 18GHz SPA-3 SPA-5 Dimension: 605 x 605 x 127 mmFrequency range: 500MHz ~ 18GHz SPA-5 SPA-8 Dimension: 605 x 605 x 203 mmFrequency range: 500MHz ~ 18GHz SPA-8 SPA-12 Dimension: 605 x 605 x 305 mmFrequency range: 500MHz ~ 18GHz SPA-12 SPA-18 Dimension: 605 x 605 x 457 mmFrequency range: 500MHz ~ 18GHz SPA-18 SPA-24 Dimension: 605 x 605 x 600 mmFrequency range: 300MHz ~ 18GHz SPA-24 SHA-18 Dimension: 605 x 605 x 305 mmFrequency range: 500MHz ~ 18GHz SHA-18 SHA-24 Dimension: 605 x 605 x 507 mmFrequency range: 500MHz ~ 18GHz SHA-24