stabilized antenna

Try SeaTel: https://www.cobham.com/about-cobham/avionics-and-surveillance/about-us/satcom/co...

Best regards, Eric.
wxw

Here are some more names to try:

Sea Tel 4006 1.0 metre Antenna
Orbit AL-7103 "Orsat" 1.15 metre Antenna range of
Schlumberger Spacetrack  range of antennas
Sola (Broadpoint) Stabilised Antennas Seatel9797, ELSP, Orbit AL-7103, AVL/Tracstar 0.96 auto acquire
KNS Supertrack Z12 MKII 1.2 metre Antenna
C2Sat 1.2 metre Antenna datasheet 2.4Mbyte pdf
EPak 0.90 metre Antenna
CVG CBSP-SSG 1.17 metre Antenna

I can't vouch for any of these and don't know prices etc.

Here is an evaluation of the RF characterisics of a number of antennas
INTELLIAN 0.6 S60
KNS 0.6 and 0.85 Supertrack Z6Mk2 Z8
KVH 0.6 KVH-60cm
MAC 0.75 ISA 75
NAVISYSTEM 0.7, 0.81, 0.95
ORBIT 1.15 AL7103 EA A033
RADIO MARINE 0.8 Broadband 80
SEATEL 0.6, 0.6, 1, 1.5 WSAT24 2406 4006 6006
SITEP 0.8 Sitep 80
and their validation (or otherwise) by Eutelsat.
https://www.eutelsat.com/satellites/pdf/Earth-Station-Vessels.pdf

Note that small antennas tend to be unacceptable for use due to interference problems.  Make sure you understand any technical limitations, such as spread spectrum being needed and case by case approval problems etc.  

Best regards, Eric.

What hub/modem vendor are you using, and what kind of link are you looking to sustain?

I will withold my recommendation until then. 

1024k by 512?  512/256k? 

What kind of equipment footprint are you considering (that is naturally, somewhat dependent on the link throughput requirements).  60cm?  1M?  1.2 Meter?

If your intent is to get some decent throughputs off the maritime/mobile VSAT platform, you need to consider spreading the upstream carrier (RTN).  Especially with smaller apertures such as 60cm and below.  Ensure you do your homework on how each of the stabilized parabolics point, because there are a few methods utilized (that each of them use to point).....some, better than others.

SCPC although technically feasible, will be limited by the fact that most providers will not allow you to put up a significant amount of power (a very large carrier), due to the likelihood of Adjacent Satellite Interference (ASI).

Bottomline: You will achieve better throughput spreading, but naturally you will need to weigh the associated costs of the MHz required to spread, against the service plans you intend to offer to see if it is cost effective.