- Modificato
MIMO on external antenna is reachable in mid range distance to the tower. I have that situation when MIMO (internal + external antenna) works and SINR is much better with additional piece of external antenna. Transfer is much stable and flat
Like I said the main rule is that the internal antenna has to still receive signals.
I agree that on long distance and hard conditions modem will work in SISO. But... not always MIMO helps as we expect even by Huaweis