Have you taken apart either the transmitter, or the receiver to see what sort of antenna is on either end?
If you are lucky the receive end will be an F connector with a stubby antenna attached, then you could extend that out . . . ..
Edit: if you always approach from the same direction you could consider a reflector behind the unit, sort of a low tech dish arrangement . . . .. .
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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