Replacement part for my wireless

[Finbar]

Okay, this is just an urgent thing really

I have a Sennheiser Freeport wireless system for my bass, and I lost the antenna/aerial for the transmitter. If I use it now, the unit has a horrible amount of background noise, so it's unusable. I tried using a length of metal threaded to the right size as an aerial, but I have the same problem.

The Sennheiser website and contact form is proving to be worse than useless at the moment.

So where can I get a replacement aerial cheaply and quickly, and what will actually work? I'm assuming it doesn't need to be a Sennheiser one to work with the Sennheiser unit.

Cheers,

Chris