I recently picked up an old Airtronics Vision tx listed as not working, parts only, because it has a bnc connector on the top of the case where the stock antenna would have fit in, and I was interested in seeing how the bnc connector was installed. Turns out the tx does work - all the better. Inside the case it looks like whoever added the bnc connector just used a piece of hookup wire from the old antenna base mount up to the bnc connector at the top of the case. Seems this woud work ok if using an antenna with a bnc connector at the base.
My need is for an external antenna about ten feet from the tx - the tx would be on my desk, and the antenna outside a window. Would it be better to use a piece of coax internal to the tx from the antenna connection up to the bnc at the top of the case? Only other post I've seen about using an external antenna suggested removing the transmit module, and locating it separate from the tx. In my case, the outside location would be more or less permanent, so not sure about the durability of the tx module with winter coming even if it is in a waterproof case.
My goal is to get a reliable signal about one mile away. More or less line of site except for a lot of trees. Tx antenna will be outside a second floor window, and the rx antenna will be about 15 - 18 feet above ground. I will provide more info on the project if needed.