Sanwa Exzes Z - which receiver

[brown4s]

Hi all,

I have an Exzes Z with a Rx-471 receiver, I need to get 2 more rx’s, I’m assuming I should be going for the Sanwa rx’s that have the integrated aerial which seems a good idea but there are a few to choose from and they also differ in price.

With integrated aerial:

Rx-481
Rx-482
Rx-481 waterproof

Quite like the option of the waterproof one but is there one model I should consider over the others or are they all good ?

Appreciate any advice

Cheers