Most AshM these days have a range of 150-200, some even 300 km. So, that 100 miles is not going to do you much good in as far as even that won't allow you to 'reach out and touch' the launch platforms (aircraft). But, you might have some more time to deal with incoming missiles
(that is, if you radar is good enough to detect seaskimmers at that range)
The AN/SPY-1 has a range of more than 115 miles (185 km). While sources on the one hand state the AN/SPY-1 has a range of at least 190 km = 100nm, other sources state it still has a slightly shorter horizon than the SPS-49 (Range, 3 nmi / 5.6 km to 256 nmi /474 km). So, go figure. Raytheon's AN/SPY-3, variously referred to as New Multifunction Radar, has a classified maximum range, with USN literature stating "...200NM+" i.e. similar to SPY-1
Thales APAR has a max range of about 150km against large targets in free space and does horizon search out to 75km.
The Thales (Signaal) DA08 on some of the ex RN Type 21 in PN service has a claimed range on a 2m2 target of 78-92 nm (some sources state 204 km or 110 nm) for 2 m2 target i.e. not much shorter than SPY-1! LW-08 has 145nm range. Still, there is a hugely different detection capability involved.
Info on newer 3d Thales MW08
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA233492
Maximum free-apace, singlo-scan detection range, at 80% probability of detection
2 m2 target SW 1 32 km [i.e. AIRCRAFT]
1 m2 target SW 1 27 km
0.1 m2 target SW 3 17 km [i.e. MISSILE]
Note the effect of target surface on detection range...
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