FS1000A / XY-MK-5V 433Mhz TX/RX Module

Hi
I have got a number of this units and are strugling a bit.
Using one ANano and one AUno and the FS1000A.
I can only get them to transfeer bytes within 20cm.
Tested with VCC 10V and 5V, tested with home made coiled antenna and long wire antenna about 30cm. I have tested 2 different TX modules, tried moving away from the domestic WIFI systems to try to avoid them disturbing. Testing tuning the RX drossel without getting any longer distance.
I was hoping I could use them for a bit longer distance than 20cm.
Using standard lib and close to standard examples with wirtual wire.

Do any body have a clue?''
using 2000bs as the standard example.

Yngve.