Many dishes to receive one signal ?

It really depends which sat it is your trying to pickup........

Here is a guide for : Recommended Dish sizes

Intelsat-20-----------------------68.5 east-----100cm
Intelsat-902 ---------------------62 east-------100cm
NSS-12----------------------------57 east-------80cm
Express AM-22 --------------------53 east-------80cm to 120cm
Intelsat-10-----------------------47.5 east-----100 to 120cm
AzerSat-1 ------------------------46 east-------80cm (West beam)
AzerSat-1 ------------------------46 east ( No reception on East beam with 100cm)
Intelsat-12 ----------------------45 east-------70 cm
Turksat 2A/3A/4A east ------------42 east ------80cm for West Beam reception
Turksat 2A/3A/4A east ------------42 east ------180 to 300cm East Beam
Hellas-Sat-2 ---------------------39east--------60cm to 80cm,
Eutelsat-36B----------------------36east--------100cm reception only for European beam---
Eutelsat 31A----------------------30.8 east ----100cm
Eutelsat 33A ---------------------33.2 east ----100cm
Astra-5B--------------------------31.5 east ----120cm to 240cm
Arabsat 5A -----------------------30.5 east -------reception possible with 150 to 240cm in the UK

Eutelsat 28A----------------------28.5 east-----45cm to 60cm
Astra 2A/2E/2F/-------------------28.2 east-----45cm to 60cm.
Badr- 4 --------------------------26 east-------100cm to 120cm = South UK ----- 120 to 180cm = North UK
Badr-5 & 6------------------------26 east ------No reception with 100cm dish in the UK
Eutelsat 25B / Es'hail-1 ---------25.5 east---- No reception with 100cm dish in the UK
Astra--3B-------------------------23.5 east ----80 to 90cm
Eutelsat-21B----------------------21.5 east ----90 to 120 cm
Astra-1-KR/1L/1M/1N---------------19.2 east-----45cm South UK----60cm North UK.
Eutelsat 16A----------------------16 east ------80cm
Eutelsat Hotbird13B/13C/13D-------13 east------60cm
Eutelsat-10A ---------------------10 east-------90 to 120cm
Eutelsat -9A ----------------------9 east-------70cm
Eutelsat-7A/7B --------------------7 east-------80cm
SES-5 -----------------------------5 east-------120 to 240cm for this Nordic beam
Astra 4A---------------------------4.8 east-----100 to 120cm Nordic beam
Astra 4A --------------------------4.8 east-----80cm European beam,
Eutelsat 3B -----------------------3.1 east-----100cm

Thor-5 & 6 -------------------------0.8 west----80 cm European beam
Thor-5 & 6 -------------------------0.8 west----100 cm for Nordic beam in South East England
Intelsat-10-02 ---------------------1 west------90cm
Amos-2 & 3--------------------------4 west------100cm to 120cm no reliable service in UK
Eutelsat 5 West A ------------------5 west -----80cm.
Nilesat-102 ------------------------7 west------100 to 150cm for some vertical transponder's for Horizontal Tp's

240cm + but no reliable reception possible in the UK as we are well outside the service area for this

satellite,best reception is on the South coast of the UK,
Nilesat 201 ------------------------7 west ----------------{ No reception in UK with 100cm dish}
Eutelsat 7 West A-------------------7.3 west-----------100cm South East England
Eutelsat 8 West C ------------------7.8 west------------ (No reception in UK with 100cm dish)
Eutelsat 8 West A-------------------8 west-------------100cm.
Express AM44------------------------11 west------------90cm
Eutelsat 12 West A -----------------12.5 west ---------90cm
Telstar-12 -------------------------15 west -----------90cm
Intelsat-901 -----------------------18 west -----------90cm
NSS-7 ------------------------------20 west -----------90cm
SES-4 ------------------------------22 west -----------90cm
Intelsat-905 -----------------------24.5 west----------90cm
Intelsat-907 -----------------------27.5 west ---------90cm
Hispasat-1D/1E ---------------------30 west------------80cm
Intelsat-903 -----------------------34.5 west ---------90cm ----(only occasional feeds here not very active)
Telstar 11N ------------------------37.5 west ---------90cm -----(Occasional feeds)
Intelsat-14-------------------------45.1 west----------90cm
Amazonas-1--------------------------55.5 west----------90cm

Quote from anorak_ian

Thanks for the reply and very interesting info.
But that Isn't really what I had in mind.

Ok, say I want to pick up Arabsat 30.5 E, on your list it says 150 cm dish, don't have that but do have 15 mini sky dishes all over the roof of my garage all pointed to that satellite. Now what little black box of wizardry do I join all those dishes together with to get that signal? :)

it would never work bud.... 15 small dishes equals 15 LNB's (each dish will have one) and 15 small sky dishes is way bigger than a one piece 150cm dish.....

The sat signal has to bounce of one part of the dish and then be picked up by the lnb to send that signal down the feed connected to it to the receiver.....

Actally there was such a device called phase combiner for 4 sat C band LNB, some guys from silicon valley made it,
but it was in analog era. There was article about it in some old telesatelite magazines in 90s.