I'm not sure this forum is a great place to get engineering information
On the NHQ comm staff, we have some very talented engineering folk that can give you a lot of data on the Isotron and also work with you on developing a possible solution for a small lot. You can email them direct at DOKE and they will give you some good information and even help you design an antenna for a small lot. If you want information on the T2FD (or the CAP's current variant) contact DOKO and Chuck can help you with information on the correct way to put up this antenna. He uses one daily for the national nets and he has a great signal.
You can always reach out to DOK and get help as well. We can put you in contact with your wing or region communications people.
Welcome to CAP ... it's rewarding or frustrating depending on the day of the week or the hour of the day.
BTW all the office symbols for comm folk (above) are at the gov domain at capnhq.
Jerry