Are ADR fees deductible against the dividends or just an Investment Expense?
ADR fees are investment expenses, deductible in the year assessed. Usually this is a fee by the bank that is processing the dividends for deposit into your US bank; so it is associated with the dividends and does not affect the cost basis of the underlying stock.
List these fees on Form 1040 Schedule A line 23 with your other investment expenses.
I hope this helps for deducting your ADR fees.