As you are probably already aware, the government require local authorities to put forward proposals for sites to accommodate the travelling community. The proposals for Chiltern District are detailed here, in the Delivery Development Plan Document.
If you would like to put your opinions in writing, here is a shell document taken from a recent submission regarding Site 6, off Rushmere Lane near Ley Hill. It is strongly recommended that you amend it so that the finished article is in your own words, but hopefully it will provide you with a starting point.
You can see the position and current layout of the site on Google Maps:
Submissions are invited up until 14th October and the postal and email addresses are given in the Chiltern DDPD linked to above.
The attached file was created in Microsoft Word, but if you require a different format, please get in touch with firstname.lastname@example.org