Thanks.
In that environment, my recommendation would be to go coax and ethernet versus wireless. Hopefully, you will be able to run cable(s) through the 30 feet of space either on poles, or maybe underground...
My reasoning is that using wireless will be subject to too much degradation and interference. Resulting speeds will not provide the performance level you will want to have. 55 feet is well within coax and ethernet distances plus some additional footage for the internal runs.
However, if there is a good wireless solution out there then that should be considered as that would meet your opening requirement for wifi.