Siemens radio 423mhz cable free

[housetrained]

this controls the central heating and works fine if the sender is placed
next to the receiver. Anywhere else in the home and it's hit or miss. Is
there a way to boost the radio signal?
housetrained

 

[Woody]

this controls the central heating and works fine if the sender
is placed next to the receiver. Anywhere else in the home and
it's hit or miss. Is there a way to boost the radio signal?
housetrained

For the record usually 433.2MHz